115-432: Human sexuality is the way people experience and express themselves sexually . This involves biological , psychological , physical , erotic , emotional , social , or spiritual feelings and behaviors. Because it is a broad term, which has varied with historical contexts over time, it lacks a precise definition. The biological and physical aspects of sexuality largely concern the human reproductive functions , including
230-438: A means to an end , to increase emotional connection , and to alleviate insecurity . Most people engage in sexual activity because of pleasure they derive from the arousal of their sexuality , especially if they can achieve orgasm . Sexual arousal can also be experienced from foreplay and flirting, and from fetish or BDSM activities, or other erotic activities . Most commonly, people engage in sexual activity because of
345-550: A child or adolescent is sometimes referred to as the sexualization of the child, and may be considered a milestone or a change of status, as the loss of virginity or innocence. Youth are legally free to have intercourse after they reach the age of consent . A 1999 survey of students indicated that approximately 40% of ninth graders across the United States report having had sexual intercourse. This figure rises with each grade. Males are more sexually active than females at each of
460-460: A fertilized egg (ovum) will implant itself and grow into a fetus. The uterus lies in the pelvic cavity between the bladder and the bowel , and above the vagina. It is usually positioned in a 90-degree angle tilting forward, although in about 20% of women it tilts backwards. The uterus has three layers; the innermost layer is the endometrium , where the egg is implanted. During ovulation, this thickens for implantation. If implantation does not occur, it
575-490: A given relationship – are known as switches . The precise definition of roles and self-identification is a common subject of debate within the community. In a 2013 study, researchers stated that BDSM is a sexual act where participants play role games, use restraint, use power exchange, use suppression and pain is sometimes involved depending on individual(s). The study serves to challenge the widespread notion that BDSM could be in some way linked to psychopathology . According to
690-548: A higher need for fulfillment. When this need was satisfied, they felt better about themselves. This was correlated with greater closeness to their partner and higher overall satisfaction in their relationship. Though both sexes engaged in sexual activity for self-determined reasons, there were some differences found between males and females. It was concluded that females had more motivation than males to engage in sexual activity for self-determined reasons. Females also had higher satisfaction and relationship quality than males did from
805-447: A higher number of sexual partners) than women. These theories are mostly consistent with observed differences in males' and females' attitudes toward casual sex before marriage in the United States. Other aspects of human sexuality, such as sexual satisfaction, incidence of oral sex , and attitudes toward homosexuality and masturbation , show little to no observed difference between males and females. Observed gender differences regarding
920-437: A man is masculine, he is heterosexual, and if a man is feminine, he is homosexual. There is no strong evidence that a homosexual or bisexual orientation must be associated with atypical gender roles. By the early 21st century, homosexuality was no longer considered to be a pathology. Theories have linked many factors, including genetic, anatomical, birth order, and hormones in the prenatal environment, to homosexuality. Other than
1035-441: A monthly basis. Once matured, these are called Graafian follicles . The female reproductive system does not produce the ova; about 60,000 ova are present at birth, only 400 of which will mature during the woman's lifetime. Ovulation is based on a monthly cycle; the 14th day is the most fertile. On days one to four, menstruation and production of estrogen and progesterone decreases, and the endometrium starts thinning. The endometrium
1150-407: A need. The participants have remarked that they enjoy pleasing their partner in any way they can and many surveyed have felt that this is one of the best things about BDSM. It gives a submissive pleasure to do things in general for their Dominant while a Dominant enjoys making their encounters all about their submissive and enjoy doing things that makes their submissive happy. The findings indicate that
1265-599: A pinkish appearance. Near the anus, the labia minora merge with the labia majora. In a sexually unstimulated state, the labia minora protects the vaginal and urethral opening by covering them. At the base of the labia minora are the Bartholin's glands , which add a few drops of an alkaline fluid to the vagina via ducts; this fluid helps to counteract the acidity of the outer vagina since sperm cannot live in an acidic environment. The Skene's glands are possibly responsible for secreting fluid during female ejaculation . The clitoris
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#17328587340981380-525: A pregnancy. To reduce the risk of unintended pregnancies, some people who engage in penile-vaginal sex may use contraception , such as birth control pills , a condom , diaphragms , spermicides , hormonal contraception or sterilization. The effectiveness of the various contraceptive methods in avoiding pregnancy varies considerably, and depends on the method rather than the user. Sexual activity that involves skin-to-skin contact, exposure to an infected person's bodily fluids or mucous membranes carries
1495-455: A profound sense of relaxation, especially in the postcoital period. From a biochemical perspective, sex causes the release of oxytocin and endorphins and boosts the immune system. People engage in sexual activity for any of a multitude of possible reasons. Although the primary evolutionary purpose of sexual activity is reproduction, research on college students suggested that people have sex for four general reasons: physical attraction , as
1610-438: A relationship but want to hide polygamous activity (possibly of opposite sexual orientation) from their partner, may solicit consensual sexual activity with others through personal contacts, online chat rooms , or, advertising in select media. Swinging involves singles or partners in a committed relationship engaging in sexual activities with others as a recreational or social activity. The increasing popularity of swinging
1725-572: A sensual current, including our wish to gratify sexual impulses. During adolescence, a young person tries to integrate these two emotional currents. Human sexual activity Human sexual activity , human sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality . People engage in a variety of sexual acts, ranging from activities done alone (e.g., masturbation ) to acts with another person (e.g., sexual intercourse , non-penetrative sex , oral sex , etc.) in varying patterns of frequency, for
1840-472: A set of gender categories that can serve as the basis of the formation of a person's social identity in relation to other members of society. Sexual behavior and intimate relationships are strongly influenced by a person's sexual orientation. Sexual orientation is an enduring pattern of romantic or sexual attraction (or a combination of these) to persons of the opposite sex, same sex, or both sexes. Heterosexual people are romantically/sexually attracted to
1955-635: A sex act, it may be referred to as group sex . Autoerotic sexual activity can involve use of dildos , vibrators , butt plugs , and other sex toys , though these devices can also be used with a partner. Sexual activity can be classified into the gender and sexual orientation of the participants, as well as by the relationship of the participants. The relationships can be ones of marriage, intimate partners , casual sex partners or anonymous . Sexual activity can be regarded as conventional or as alternative , involving, for example, fetishism or BDSM activities. Fetishism can take many forms, including
2070-473: A sexual relationship when the participants have positive feelings associated with the relationship. These participants do not feel guilty or coerced into the partnership. Researchers have proposed the model of self-determined sexual motivation. The purpose of this model is to connect self-determination and sexual motivation. This model has helped to explain how people are sexually motivated when involved in self-determined dating relationships. This model also links
2185-678: A study, sexual experiences help teenagers understand pleasure and satisfaction. In relation to hedonic and eudaimonic well-being, it stated that teenagers can positively benefit from sexual activity. The cross-sectional study was conducted in 2008 and 2009 at a rural upstate New York community. Teenagers who had their first sexual experience at age 16 revealed a higher well-being than those who were sexually inexperienced or who became sexually active at age 17. Furthermore, teenagers who had their first sexual experience at age 15 or younger, or who had many sexual partners were not negatively affected and did not have associated lower well-being. Sexual activity
2300-458: A variety of ways, and may or may not express it in their behaviors. Research indicates that many gay men and lesbians want, and succeed in having, committed and durable relationships. For example, survey data indicate that between 40% and 60% of gay men and between 45% and 80% of lesbians are currently involved in a romantic relationship. It is possible for a person whose sexual identity is mainly heterosexual to engage in sexual acts with people of
2415-706: A wide variety of reasons. Sexual activity usually results in sexual arousal and physiological changes in the aroused person, some of which are pronounced while others are more subtle. Sexual activity may also include conduct and activities which are intended to arouse the sexual interest of another or enhance the sex life of another, such as strategies to find or attract partners ( courtship and display behaviour), or personal interactions between individuals (for instance, foreplay or BDSM ). Sexual activity may follow sexual arousal. Human sexual activity has sociological, cognitive, emotional , behavioural and biological aspects. It involves personal bonding , sharing emotions,
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#17328587340982530-750: Is a female sexual dysfunction leading to a lack of vaginal lubrication. In addition, blood flow problems may affect arousal disorder. Lack of orgasm, also known as anorgasmia, is another sexual dysfunction in women. The last sexual disorder is painful intercourse, which can be caused by factors including pelvic mass, scar tissue, and sexually transmitted infections. Three common sexual disorders for men are sexual desire disorder, ejaculation disorder, and erectile dysfunction. Lack of sexual desire in men may be caused by physical issues like low testosterone or psychological factors such as anxiety and depression. Ejaculation disorders include retrograde ejaculation, retarded ejaculation, and premature ejaculation. Erectile dysfunction
2645-441: Is a small area at the base of the brain consisting of several groups of nerve cell bodies that receive input from the limbic system . Studies have shown that within lab animals, the destruction of certain areas of the hypothalamus causes the elimination of sexual behavior. The hypothalamus is important because of its relationship to the pituitary gland , which lies beneath it. The pituitary gland secretes hormones that are produced in
2760-529: Is affected by cultural, political, legal, philosophical, moral , ethical , and religious aspects of life. Interest in sexual activity normally increases when an individual reaches puberty . Although no single theory on the cause of sexual orientation has yet gained widespread support, there is considerably more evidence supporting nonsocial causes of sexual orientation than social ones, especially for males. Hypothesized social causes are supported by only weak evidence, distorted by numerous confounding factors. This
2875-557: Is also cyclic, but unlike the female ovulation cycle, the sperm production cycle is constantly producing millions of sperm daily. The external male genitalia are the penis and the scrotum . The penis provides a passageway for sperm and urine. The penis consists of nerves, blood vessels, fibrous tissue, and three parallel cylinders of spongy tissue. Other components of the penis include the shaft , glans , root, cavernous bodies , and spongy body . The three cylindrical bodies of spongy tissue, which are filled with blood vessels, run along
2990-527: Is also released in women when they give birth or are breastfeeding. Prolactin and oxytocin are responsible for inducing milk production in women. Follicle-stimulating hormone (FSH) is responsible for ovulation in women, and acts by triggering egg maturity; in men, it stimulates sperm production. Luteinizing hormone (LH) triggers ovulation, which is the release of a mature egg. Males have both internal and external genitalia that are responsible for procreation and sexual intercourse. Production of spermatozoa ( sperm )
3105-402: Is also the birth canal ; it can expand to 10 cm (3.9 in) during labor and delivery. The vagina is located between the bladder and the rectum . The vagina is normally collapsed, but during sexual arousal it opens, lengthens, and produces lubrication to allow the insertion of the penis. The vagina has three layered walls; it is a self-cleaning organ with natural bacteria that suppress
3220-400: Is an inability to initiate and maintain an erection during intercourse. As one form of behavior, the psychological aspects of sexual expression have been studied in the context of emotional involvement, gender identity, intersubjective intimacy, and Darwinian reproductive efficacy. Sexuality in humans generates profound emotional and psychological responses. Some theorists identify sexuality as
3335-455: Is an innately physiological function, but like other physical activity, it comes with risks. There are four main types of risks that may arise from sexual activity: unwanted pregnancy , contracting a sexually transmitted infection (STI), physical injury, and psychological injury. Any sexual activity that involves the introduction of semen into a woman's vagina, such as during sexual intercourse, or contact of semen with her vulva, may result in
3450-602: Is characterized by the potential for aesthetic attraction, romantic love , or sexual desire towards people without regard for their gender identity or biological sex . Some pansexuals suggest that they are gender-blind ; that gender and sex are insignificant or irrelevant in determining whether they will be sexually attracted to others. As defined in the Oxford English Dictionary , pansexuality "encompasses all kinds of sexuality; not limited or inhibited in sexual choice with regards to gender or practice". Although
3565-835: Is considerably more evidence supporting innate causes of sexual orientation than learned ones, especially for males. This evidence includes the cross-cultural correlation of homosexuality and childhood gender nonconformity , moderate genetic influences found in twin studies , evidence for prenatal hormonal effects on brain organization, the fraternal birth order effect , and the finding that in rare cases where infant males were raised as girls due to physical differences or deformity, they nevertheless turned out attracted to females. Hypothesized social causes are supported by only weak evidence, distorted by numerous confounding factors. Cross-cultural evidence also leans more toward non-social causes. Cultures that are very tolerant of homosexuality do not have significantly higher rates of it. Homosexual behavior
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3680-470: Is developed from the same embryonic tissue as the penis; it or its glans alone consists of as many (or more in some cases) nerve endings as the human penis or glans penis, making it extremely sensitive to touch. The clitoral glans, which is a small, elongated erectile structure, has only one known function—sexual sensations. It is the female's most sensitive erogenous zone and the main source of orgasm in women. Thick secretions called smegma collect around
3795-610: Is further supported by cross-cultural evidence because cultures that are tolerant of homosexuality do not have significantly higher rates of it. Evolutionary perspectives on human coupling, reproduction and reproduction strategies , and social learning theory provide further views of sexuality. Sociocultural aspects of sexuality include historical developments and religious beliefs . Some cultures have been described as sexually repressive . The study of sexuality also includes human identity within social groups, sexually transmitted infections (STIs), and birth control methods. There
3910-454: Is generally influenced by social rules that are culturally specific and vary widely. Sexual ethics, morals, and norms relate to issues including deception/honesty, legality, fidelity and consent. Some activities, known as sex crimes in some locations, are illegal in some jurisdictions, including those conducted between (or among) consenting and competent adults (examples include sodomy law and adult-adult incest ). Some people who are in
4025-772: Is not fully understood why genes causing homosexuality persist in the gene pool. One hypothesis involves kin selection , suggesting that homosexuals invest heavily enough in their relatives to offset the cost of not reproducing as much directly. This has not been supported by studies in Western cultures, but several studies in Samoa have found some support for this hypothesis. Another hypothesis involves sexually antagonistic genes, which cause homosexuality when expressed in males but increase reproduction when expressed in females. Studies in both Western and non-Western cultures have found support for this hypothesis. Psychological theories exist regarding
4140-576: Is one of the strongest human drives. It is an innate feature of human nature, and may be related to the sex drive . The human mating process encompasses the social and cultural processes whereby one person may meet another to assess suitability, the courtship process and the process of forming an interpersonal relationship . Commonalities, however, can be found between humans and nonhuman animals in mating behavior. The physiological responses during sexual stimulation are fairly similar for both men and women and there are four phases. Sexual dysfunction
4255-589: Is recognized, and promotion of equity between men and women is crucial for attaining sexual and reproductive health , as stated by the UN International Conference on Population and Development Program of Action: BDSM is a variety of erotic practices or roleplaying involving bondage , dominance and submission , sadomasochism , and other interpersonal dynamics. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves as practicing BDSM, inclusion in
4370-522: Is regarded by some as arising from the upsurge in sexual activity during the sexual revolution of the 1960s. Some people engage in various sexual activities as a business transaction. When this involves having sex with, or performing certain actual sexual acts for another person in exchange for money or something of value, it is called prostitution. Other aspects of the adult industry include phone sex operators, strip clubs , and pornography. Social gender roles can influence sexual behavior as well as
4485-500: Is relatively common among boys in British single-sex boarding schools, but adult Britons who attended such schools are no more likely to engage in homosexual behavior than those who did not. In an extreme case, the Sambia people ritually require their boys to engage in homosexual behavior during adolescence before they have any access to females, yet most of these boys become heterosexual. It
4600-437: Is sloughed off during menstruation. The cervix is the narrow end of the uterus. The broad part of the uterus is the fundus . During ovulation , the ovum travels down the fallopian tubes to the uterus. These extend about four inches (10 cm) from both sides of the uterus. Finger-like projections at the ends of the tubes brush the ovaries and receive the ovum once it is released. The ovum then travels for three to four days to
4715-412: Is sloughed off for the next three to six days. Once menstruation ends, the cycle begins again with an FSH surge from the pituitary gland. Days five to thirteen are known as the pre-ovulatory stage. During this stage, the pituitary gland secretes follicle-stimulating hormone (FSH). A negative feedback loop is enacted when estrogen is secreted to inhibit the release of FSH. Estrogen thickens the endometrium of
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4830-522: Is the inability to react emotionally or physically to sexual stimulation in a way projected of the average healthy person; it can affect different stages in the sexual response cycles, which are desire, excitement and orgasm. In the media, sexual dysfunction is often associated with men, but in actuality, it is more commonly observed in females (43 percent) than males (31 percent). Sexual activity can lower blood pressure and overall stress levels. It serves to release tension, elevate mood, and possibly create
4945-414: Is the most important motivating force in adult life. Freud wrote about the importance of interpersonal relationships to one's sexual and emotional development. From birth, the mother's connection to the infant affects the infant's later capacity for pleasure and attachment . Freud described two currents of emotional life; an affectionate current, including our bonds with the important people in our lives; and
5060-410: Is the release of tension, and the resolution period is the unaroused state before the cycle begins again. The male sexual response cycle starts in the excitement phase; two centers in the spine are responsible for erections. Vasoconstriction in the penis begins, the heart rate increases, the scrotum thickens, the spermatic cord shortens, and the testicles become engorged with blood. In the plateau phase,
5175-530: Is to provide milk to a developing infant. Breasts develop during puberty in response to an increase in estrogen. Each adult breast consists of 15 to 20 milk-producing mammary glands , irregularly shaped lobes that include alveolar glands and a lactiferous duct leading to the nipple. The lobes are separated by dense connective tissues that support the glands and attach them to the tissues on the underlying pectoral muscles. Other connective tissue, which forms dense strands called suspensory ligaments, extends inward from
5290-529: The Cowper's gland . The testicles (male gonads), are where sperm and male hormones are produced. Millions of sperm are produced daily in several hundred seminiferous tubules. Cells called the Leydig cells lie between the tubules; these produce hormones called androgens; these consist of testosterone and inhibin . The testicles are held by the spermatic cord, which is a tubelike structure containing blood vessels, nerves,
5405-608: The Kinsey Institute , the average frequency of sexual intercourse in the US for individuals with partners is 112 times per year (age 18–29), 86 times per year (age 30–39), and 69 times per year (age 40–49). The rate of sexual activity has been declining in the 21st century, a phenomenon that has been described as a sex recession . The age at which adolescents become sexually active varies considerably between different cultures and times. (See Prevalence of virginity .) The first sexual act of
5520-415: The corpus luteum —secretes estrogen. Production of progesterone increases, inhibiting LH release. The endometrium thickens to prepare for implantation, and the ovum travels down the fallopian tubes to the uterus. If the ovum is not fertilized and does not implant, menstruation begins. The sexual response cycle is a model that describes the physiological responses that occur during sexual activity. This model
5635-421: The development of the reproductive system . As adults, they have different reproductive mechanisms that enable them to perform sexual acts and to reproduce. Men and women react similarly to sexual stimuli with minor differences. Women have a monthly reproductive cycle, whereas the male sperm production cycle is more continuous. The hypothalamus is the most important part of the brain for sexual functioning. This
5750-493: The human sexual response cycle . Someone's sexual orientation is their pattern of sexual interest in the opposite and/or same sex. Physical and emotional aspects of sexuality include bonds between individuals that are expressed through profound feelings or physical manifestations of love , trust, and care. Social aspects deal with the effects of human society on one's sexuality, while spirituality concerns an individual's spiritual connection with others. Sexuality also affects and
5865-563: The labia or "lips". The labia majora are two elongated folds of skin extending from the mons to the perineum . Its outer surface becomes covered with hair after puberty. In between the labia majora are the labia minora, two hairless folds of skin that meet above the clitoris to form the clitoral hood , which is highly sensitive to touch. The labia minora become engorged with blood during sexual stimulation, causing them to swell and turn red. The labia minora are composed of connective tissues that are richly supplied with blood vessels which cause
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#17328587340985980-660: The norms of certain societies or cultures. Two examples that are criminal offences in most jurisdictions are sexual assault and sexual activity with a person below the local age of consent . Sexual activity can be classified in a number of ways. The practices may be preceded by or consist solely of foreplay . Acts involving one person ( autoeroticism ) may include sexual fantasy or masturbation . If two people are involved, they may engage in vaginal sex, anal sex , oral sex or manual sex . Penetrative sex between two people may be described as sexual intercourse , but definitions vary. If there are more than two participants in
6095-403: The physiology of the reproductive system , sex drive , sexual intercourse, and sexual behaviour in all its forms. In some cultures, sexual activity is considered acceptable only within marriage , while premarital and extramarital sex are taboo . Some sexual activities are illegal either universally or in some countries or subnational jurisdictions, while some are considered contrary to
6210-466: The sexual desire generated by a person to whom they feel sexual attraction ; but they may engage in sexual activity for the physical satisfaction they achieve in the absence of attraction for another, as in the case of casual or social sex . At times, a person may engage in a sexual activity solely for the sexual pleasure of their partner, such as because of an obligation they may have to the partner or because of love, sympathy or pity they may feel for
6325-461: The BDSM community or subculture usually being dependent on self-identification and shared experience. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers , extreme body modification enthusiasts, animal players , latex or rubber aficionados , and others. B/D (bondage and discipline) is a part of BDSM. Bondage includes
6440-419: The acidity of the vagina. The Cowper's glands, or bulbourethral glands, are two pea-sized structures beneath the prostate. The external female genitalia are the vulva . The mons pubis is a soft layer of fatty tissue overlaying the pubic bone. Following puberty, this area grows in size. It has many nerve endings and is sensitive to stimulation. The labia minora and labia majora are collectively known as
6555-426: The age, gender, marital status or other factors of the participants, or otherwise contrary to social norms or generally accepted sexual morals . In evolutionary psychology and behavioral ecology , human mating strategies are a set of behaviors used by individuals to attract, select, and retain mates . Mating strategies overlap with reproductive strategies, which encompass a broader set of behaviors involving
6670-460: The autoerotic case due to the isolation and lack of assistance in the event of a problem. Sexual activity that is consensual is sexual activity in which both or all participants agree to take part and are of the age that they can consent. If sexual activity takes place under force or duress, it is considered rape or another form of sexual assault . In different cultures and countries, various sexual activities may be lawful or illegal in regards to
6785-430: The bladder and in front of the rectum. It consists of two main zones: the inner zone that produces secretions to keep the lining of the male urethra moist and the outer zone that produces seminal fluids to facilitate the passage of semen. The seminal vesicles secrete fructose for sperm activation and mobilization, prostaglandins to cause uterine contractions that aid movement through the uterus, and bases that help neutralize
6900-429: The body, one possible reason for this is so sperm can be produced in an environment slightly lower than normal body temperature. The penis has very little muscular tissue, and this exists in its root. The shaft and glans have no muscle fibers. Unlike most other primates, male humans lack a penile bone . Male internal reproductive structures are the testicles , the duct system, the prostate and seminal vesicles , and
7015-624: The central source of human personality. Psychological studies of sexuality focus on psychological influences that affect sexual behavior and experiences. Early psychological analyses were carried out by Sigmund Freud , who believed in a psychoanalytic approach. He also proposed the concepts of psychosexual development and the Oedipus complex , among other theories. Gender identity is a person's sense of their own gender , whether male, female, or non-binary . Gender identity can correlate with assigned sex at birth or can differ from it. All societies have
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#17328587340987130-418: The chest and back; breasts increase slightly in size and nipples may become hardened and erect. The onset of vasocongestion results in swelling of the clitoris, labia minora, and vagina. The muscle that surrounds the vaginal opening tightens and the uterus elevates and grows in size. The vaginal walls begin to produce a lubricating liquid. The second phase, called the plateau phase, is characterized primarily by
7245-432: The clitoris, vagina, and cervix). This may be why many women find nipple stimulation arousing and why some women are able to orgasm by nipple stimulation alone. The female internal reproductive organs are the vagina , uterus , fallopian tubes , and ovaries . The vagina is a sheath-like canal that extends from the vulva to the cervix. It receives the penis during intercourse and serves as a depository for sperm. The vagina
7360-454: The clitoris. The vaginal opening and the urethral opening are only visible when the labia minora are parted. These openings have many nerve endings that make them sensitive to touch. They are surrounded by a ring of sphincter muscles called the bulbocavernosus muscle . Underneath this muscle and on opposite sides of the vaginal opening are the vestibular bulbs, which help the vagina grip the penis by swelling with blood during arousal. Within
7475-523: The contraceptive pill and other highly effective forms of contraception in the mid- and late 20th century has increased people's ability to segregate these three functions, which still overlap a great deal and in complex patterns. For example: A fertile couple may have intercourse while using contraception to experience sexual pleasure (recreational) and also as a means of emotional intimacy (relational), thus deepening their bonding, making their relationship more stable and more capable of sustaining children in
7590-437: The definition of sexual practice, abstinent or autoerotic (including masturbation ). Additionally, different religious and political movements have tried to influence or control changes in sexual practices including courting and marriage, though in most countries changes occur at a slow rate. Homosexuality is the romantic or sexual attraction to the same sex. People with a homosexual orientation can express their sexuality in
7705-489: The desire for certain body parts ( partialism ) such as breasts , navels , or feet . The object of desire can be shoes , boots , lingerie , clothing , leather or rubber items. Some non-conventional autoerotic practices can be dangerous. These include autoerotic asphyxiation and self-bondage . The potential for injury or even death that exists while engaging in the partnered versions of these fetishes (choking and bondage , respectively) becomes drastically increased in
7820-408: The development and expression of gender differences in human sexuality. A number of them (including neo-analytic theories, sociobiological theories, social learning theory, social role theory , and script theory ) agree in predicting that men should be more approving of casual sex (sex happening outside a stable, committed relationship such as marriage ) and should also be more promiscuous (have
7935-402: The duct system is the vas deferens , a muscular tube that begins at the lower end of the epididymis. The vas deferens passes upward along the side of the testicles to become part of the spermatic cord. The expanded end is the ampulla, which stores sperm before ejaculation. The third part of the duct system is the ejaculatory ducts, which are 1-inch (2.5 cm)-long paired tubes that pass through
8050-419: The expanded end of the spongy body. The bulb of the penis is surrounded by the bulbospongiosus muscle , while the corpora cavernosa are surrounded by the ischiocavernosus muscles . These aid urination and ejaculation . The penis has a foreskin that typically covers the glans; this is sometimes removed by circumcision for medical, religious or cultural reasons. In the scrotum, the testicles are held away from
8165-583: The expression of deleterious recessive mutations . The avoidance of inbreeding as a constraint on human sexual activity is apparent in the near universal cultural inhibitions in human societies of sexual activity between closely related individuals. Human outcrossing sexual activity provides the adaptive benefit of the masking of expression of deleterious recessive mutations. Alex Comfort and others propose three potential social aspects of sexual intercourse in humans, which are not mutually exclusive: reproductive, relational, and recreational. The development of
8280-446: The findings, one who participates in BDSM may have greater strength socially and mentally as well as greater independence than those who do not practice BDSM. It suggests that people who participate in BDSM play have higher subjective well-being, and that this might be due to the fact that BDSM play requires extensive communication. Before any act occurs, the partners must discuss their agreement of their relationship. They discuss how long
8395-420: The future (deferred reproductive). This same couple may emphasize different aspects of intercourse on different occasions, being playful during one episode of intercourse (recreational), experiencing deep emotional connection on another occasion (relational), and later, after discontinuing contraception, seeking to achieve pregnancy (reproductive, or more likely reproductive and relational). Human sexual activity
8510-454: The grade levels surveyed. Sexual activity of young adolescents differs in ethnicity as well. A higher percentage of African American and Hispanic adolescents are more sexually active than white adolescents. Research on sexual frequency has also been conducted solely on female adolescents who engage in sexual activity. Female adolescents tended to engage in more sexual activity due to positive mood. In female teenagers, engaging in sexual activity
8625-414: The hypothalamus and itself. The four important sexual hormones are oxytocin , prolactin , follicle-stimulating hormone , and luteinizing hormone . Oxytocin, sometimes referred to as the "love hormone", is released in both sexes during sexual intercourse when an orgasm is achieved. Oxytocin has been suggested as critical to the thoughts and behaviors required to maintain close relationships. The hormone
8740-421: The intensification of the changes begun during the excitement phase. The plateau phase extends to the brink of orgasm, which initiates the resolution stage; the reversal of the changes begun during the excitement phase. During the orgasm stage the heart rate, blood pressure, muscle tension, and breathing rates peak. The pelvic muscle near the vagina, the anal sphincter, and the uterus contract. Muscle contractions in
8855-412: The length of the shaft. The two bodies that lie side by side in the upper portion of the penis are the corpora cavernosa (cavernous bodies). The third, called the corpus spongiosum (spongy body), is a tube that lies centrally beneath the others and expands at the end to form the tip of the penis (glans). During arousal , these bodies erect the penis by filling with blood. The raised rim at the border of
8970-519: The main adaptive function of human sexual activity is reproduction, human sexual activity also includes the adaptive constraint of avoiding close inbreeding , since inbreeding can have deleterious effects on progeny. Charles Darwin, who was married to his first cousin Emma Wedgwood, considered that the ill health that plagued his family was a consequence of inbreeding. In general, inbreeding between individuals who are closely genetically related leads to
9085-737: The meeting of the genitalia between same-sex partners – tribadism (generally vulva -to-vulva rubbing) and frot (generally penis -to-penis rubbing). People who have a romantic or sexual attraction to both sexes are referred to as bisexual. People who have a distinct but not exclusive preference for one sex/gender over the other may also identify themselves as bisexual. Like gay and lesbian individuals, bisexual people who pretend to be heterosexual are often referred to as being closeted . Pansexuality (also referred to as omnisexuality) may or may not be subsumed under bisexuality, with some sources stating that bisexuality encompasses sexual or romantic attraction to all gender identities . Pansexuality
9200-490: The members of the opposite sex, gay and lesbian people are romantically/sexually attracted to people of the same sex, and those who are bisexual are romantically/sexually attracted to both sexes. The idea that homosexuality results from reversed gender roles is reinforced by the media's portrayal of gay men as feminine and lesbians as masculine. However, a person's conformity or non-conformity to gender stereotypes does not always predict sexual orientation. Society believes that if
9315-542: The need to procreate, there are many other reasons people have sex. According to one study conducted on college students (Meston & Buss, 2007), the four main reasons for sexual activities are physical attraction, as a means to an end, to increase emotional connection, and to alleviate insecurity. Until Sigmund Freud published his Three Essays on the Theory of Sexuality in 1905, children were often regarded as asexual , having no sexuality until later development. Sigmund Freud
9430-612: The number of sexual partners are modest, with males tending to have slightly more than females. Like other mammals , humans are primarily grouped into either the male or female sex. The biological aspects of human sexuality deal with the reproductive system, the sexual response cycle, and the factors that affect these aspects. They also deal with the influence of biological factors on other aspects of sexuality, such as organic and neurological responses, heredity, hormonal issues, gender issues, and sexual dysfunction. Males and females are anatomically similar; this extends to some degree to
9545-621: The opposite sex. People who engage exclusively in same-sex sexual practices may not identify themselves as gay or lesbian. In sex-segregated environments, individuals may seek relationships with others of their own gender (known as situational homosexuality ). In other cases, some people may experiment or explore their sexuality with same (or different) sex sexual activity before defining their sexual identity . Despite stereotypes and common misconceptions, there are no forms of sexual acts exclusive to same-sex sexual behavior that cannot also be found in opposite-sex sexual behavior, except those involving
9660-635: The partner. A person may engage in sexual activity for purely monetary considerations, or to obtain some advantage from either the partner or the activity. A man and woman may engage in sexual intercourse with the objective of conception . Some people engage in hate sex which occurs between two people who strongly dislike or annoy each other. It is related to the idea that opposition between two people can heighten sexual tension , attraction and interest. Research has found that people also engage in sexual activity for reasons associated with self-determination theory . The self-determination theory can be applied to
9775-400: The passive, receiving, or obedient role are known as submissives or bottoms . These terms are sometimes shortened so that a dominant person may be referred to as a "Dom" (a woman may choose to use the feminine "Domme") and a submissive may be referred to as a "sub". Individuals who can change between Top/Dominant and bottom/submissive roles – whether from relationship to relationship or within
9890-510: The penis increases in diameter, the testicles become more engorged, and the Cowper's glands secrete pre-seminal fluid. The orgasm phase, during which rhythmic contractions occur every 0.8 seconds, consists of two phases; the emission phase, in which contractions of the vas deferens, prostate, and seminal vesicles encourage ejaculation, which is the second phase of orgasm. Ejaculation is called the expulsion phase; it cannot be reached without an orgasm. In
10005-500: The play will last, the intensity, their actions, what each participant needs or desires, and what, if any, sexual activities may be included. All acts must be consensual and pleasurable to both parties. In a 2015 study, interviewed BDSM participants have mentioned that the activities have helped to create higher levels of connection, intimacy, trust and communication between partners. The study suggests that Dominants and submissives exchange control for each other's pleasure and to satisfy
10120-420: The positive outcomes, (satisfying the need for autonomy, competence, and relatedness) gained from sexual motivations. According to the completed research associated with this model, it was found that people of both sexes who engaged in sexual activity for self-determined motivation had more positive psychological well-being. While engaging in sexual activity for self-determined reasons, the participants also had
10235-469: The production of yeast. The G-spot , named after the Ernst Gräfenberg who first reported it in 1950, may be located in the front wall of the vagina and may cause orgasms. This area may vary in size and location between women; in some it may be absent. Various researchers dispute its structure or existence or regard it as an extension of the clitoris. The uterus or womb is a hollow, muscular organ where
10350-428: The prostate gland, where semen is produced. The prostate gland is a solid, chestnut-shaped organ that surrounds the first part of the urethra, which carries urine and semen. Similar to the female G-spot, the prostate provides sexual stimulation and can lead to orgasm through anal sex . The prostate gland and the seminal vesicles produce seminal fluid that is mixed with sperm to create semen. The prostate gland lies under
10465-537: The pubic area but sometimes are found on coarse hair elsewhere on the body (for example, eyebrows, eyelashes, beard, mustache, chest, armpits, etc.). Pubic lice infestations (pthiriasis) are spread through direct contact with someone who is infested with the louse. Some STIs like HIV/AIDS can also be contracted by using IV drug needles after their use by an infected person, as well as through childbirth or breastfeeding . Factors such as biological and psychological factors, diseases, mental conditions, boredom with
10580-739: The purpose of encouraging people to have sex only within marriage. Sodomy laws have been used to discourage same-sex sexual practices, but they may also affect opposite-sex sexual practices. Laws also ban adults from committing sexual abuse , committing sexual acts with anyone under an age of consent , performing sexual activities in public, and engaging in sexual activities for money (prostitution). Though these laws cover both same-sex and opposite-sex sexual activities, they may differ in regard to punishment, and may be more frequently (or exclusively) enforced on those who engage in same-sex sexual activities. Different-sex sexual practices may be monogamous , serially monogamous, or polyamorous , and, depending on
10695-679: The reaction of individuals and communities to certain incidents; the World Health Organization states that, "Sexual violence is also more likely to occur where beliefs in male sexual entitlement are strong, where gender roles are more rigid, and in countries experiencing high rates of other types of violence." Some societies, such as those where the concepts of family honor and female chastity are very strong, may practice violent control of female sexuality, through practices such as honor killings and female genital mutilation . The relation between gender equality and sexual expression
10810-451: The relationship, and widowhood have been found to contribute to a decrease in sexual interest and activity in old age, but older age does not eliminate the ability to enjoy sexual activity. Heterosexuality is the romantic or sexual attraction to the opposite sex. Heterosexual practices are institutionally privileged in most countries. In some countries, mostly those where religion has a strong influence on social policy , marriage laws serve
10925-448: The resolution phase, the male is now in an unaroused state consisting of a refractory (rest) period before the cycle can begin. This rest period may increase with age. The female sexual response begins with the excitement phase, which can last from several minutes to several hours. Characteristics of this phase include increased heart and respiratory rate, and an elevation of blood pressure. Flushed skin or blotches of redness may occur on
11040-474: The restraint of the body or mind. D/s means "Dominant and submissive". A Dominant is one who takes control of a person who wishes to surrender control and a submissive is one who surrenders control to a person who wishes to take control. S/M (sadism and masochism) is the other part of BDSM. A sadist is an individual who takes pleasure in the pain or humiliation of others and a masochist is an individual who takes pleasure from their own pain or humiliation. Unlike
11155-484: The risk of contracting a sexually transmitted infection. People may not be able to detect that their sexual partner has one or more STIs, for example if they are asymptomatic (show no symptoms). The risk of STIs can be reduced by safe sex practices, such as using condoms. Both partners may opt to be tested for STIs before engaging in sex. The exchange of body fluids is not necessary to contract an infestation of crab lice. Crab lice typically are found attached to hair in
11270-416: The same embryonic tissue as the testicles . The ovaries are suspended by ligaments and are the source where ova are stored and developed before ovulation. The ovaries also produce female hormones progesterone and estrogen . Within the ovaries, each ovum is surrounded by other cells and contained within a capsule called a primary follicle. At puberty, one or more of these follicles are stimulated to mature on
11385-404: The same sex. Gay and lesbian people who pretend to be heterosexual are often referred to as being closeted (hiding their sexuality in "the closet"). "Closet case" is a derogatory term used to refer to people who hide their sexuality. Making that orientation public can be called " coming out of the closet " in the case of voluntary disclosure or " outing " in the case of disclosure by others against
11500-487: The sexual activity. Overall, research concluded that psychological well-being, sexual motivation, and sexual satisfaction were all positively correlated when dating couples partook in sexual activity for self-determined reasons. The frequency of sexual activity might range from zero to 15 or 20 times a week. Frequency of intercourse tends to decline with age. Some post- menopausal women experience decline in frequency of sexual intercourse, while others do not. According to
11615-400: The shaft and glans is called the corona. The urethra connects the urinary bladder to the penis where urine exits the penis through the urethral meatus . The urethra eliminates urine and acts as a channel for semen and sperm to exit the body during sexual intercourse. The root consists of the expanded ends of the cavernous bodies, which fan out to form the crura and attach to the pubic bone and
11730-417: The skin of the breast to the pectoral tissue to support the weight of the breast. Heredity and the quantity of fatty tissue determine the size of the breasts. Men typically find female breasts attractive and this holds true for a variety of cultures. In women, stimulation of the nipple seems to result in activation of the brain's genital sensory cortex (the same region of the brain activated by stimulation of
11845-444: The subject's wishes (or without their knowledge). Among some communities (called "men on the DL" or " down-low "), same-sex sexual behavior is sometimes viewed as solely for physical pleasure. Men who have sex with men , as well as women who have sex with women , or men on the "down-low" may engage in sex acts with members of the same sex while continuing sexual and romantic relationships with
11960-518: The surveyed submissives and Dominants found BDSM makes play more pleasurable and fun. The participants have also mentioned improvements in their personal growth, romantic relationships, sense of community and self, the dominant's confidence, and their coping with everyday things by giving them a psychological release. Neo-analytic Too Many Requests If you report this error to the Wikimedia System Administrators, please include
12075-450: The timing of reproduction and the trade-off between quantity and quality of offspring (see life history theory ). Relative to other animals, human mating strategies are unique in their relationship with cultural variables such as the institution of marriage . Humans may seek out individuals with the intention of forming a long-term intimate relationship , marriage, casual relationship , or friendship . The human desire for companionship
12190-491: The urethra; it expels urine from the bladder. This is located below the clitoris and above the vaginal opening. The breasts are the subcutaneous tissues on the front thorax of the female body. Though they are not technically part of a woman's sexual anatomy, they do have roles in both sexual pleasure and reproduction. Breasts are modified sweat glands made up of fibrous tissues and fat that provide support and contain nerves, blood vessels, and lymphatic vessels. Their main purpose
12305-439: The usual "power neutral" relationships and play styles commonly followed by couples, activities and relationships within a BDSM context are often characterized by the participants' taking on complementary, but unequal roles; thus, the idea of informed consent of both the partners becomes essential. Participants who exert dominance (sexual or otherwise) over their partners are known as Dominants or Tops , while participants who take
12420-509: The uterus. A surge of luteinizing hormone (LH) triggers ovulation. On day 14, the LH surge causes a Graafian follicle to surface the ovary. The follicle ruptures and the ripe ovum is expelled into the abdominal cavity. The fallopian tubes pick up the ovum with the fimbria . The cervical mucus changes to aid the movement of sperm. On days 15 to 28—the post-ovulatory stage, the Graafian follicle—now called
12535-465: The uterus. After sexual intercourse, sperm swim up this funnel from the uterus. The lining of the tube and its secretions sustain the egg and the sperm, encouraging fertilization and nourishing the ovum until it reaches the uterus. If the ovum divides after fertilization, identical twins are produced. If separate eggs are fertilized by different sperm, the mother gives birth to non-identical or fraternal twins . The ovaries (female gonads), develop from
12650-935: The vaginal area create a high level of pleasure, though all orgasms are centered in the clitoris. Sexual disorders, according to the DSM-IV-TR, are disturbances in sexual desire and psycho-physiological changes that characterize the sexual response cycle and cause marked distress and interpersonal difficulty. Sexual dysfunctions are a result of physical or psychological disorders. Physical causes include hormonal imbalance, diabetes, heart disease and more; psychological causes include but are not limited to stress, anxiety, and depression. Sexual dysfunction affects both men and women. There are four major categories of sexual problems in women: desire disorders, arousal disorders, orgasmic disorders, and sexual pain disorders. Sexual desire disorder occurs when an individual lacks sexual desire because of hormonal changes, depression, and pregnancy. Arousal disorder
12765-405: The vaginal opening is the hymen , a thin membrane that partially covers the opening in many virgins . Rupture of the hymen has been historically considered the loss of one's virginity, though, by modern standards, loss of virginity is considered to be the first sexual intercourse. The hymen can be ruptured by activities other than sexual intercourse. The urethral opening connects to the bladder with
12880-420: The vas deferens, and a muscle that helps to raise and lower the testicles in response to temperature changes and sexual arousal, in which the testicles are drawn closer to the body. Sperm gets transported through a four-part duct system. The first part of this system is the epididymis . The testicles converge to form the seminiferous tubules , coiled tubes at the top and back of each testicle. The second part of
12995-492: Was created by William Masters and Virginia Johnson . According to Masters and Johnson, the human sexual response cycle consists of four phases; excitement, plateau, orgasm, and resolution, also called the EPOR model. During the excitement phase of the EPOR model, one attains the intrinsic motivation to have sex. The plateau phase is the precursor to orgasm, which may be mostly biological for men and mostly psychological for women. Orgasm
13110-454: Was directly positively correlated with being older, greater sexual activity in the previous week or prior day, and more positive mood the previous day or the same day as the sexual activity occurred. Decreased sexual activity was associated with prior or same day negative mood or menstruation. Although opinions differ, researchers suggest that sexual activity is an essential part of humans, and that teenagers need to experience sex. According to
13225-501: Was one of the first researchers to take child sexuality seriously. His ideas, such as psychosexual development and the Oedipus conflict , have been much debated but acknowledging the existence of child sexuality was an important development. Freud gave sexual drives an importance and centrality in human life, actions, and behavior; he said sexual drives exist and can be discerned in children from birth. He explains this in his theory of infantile sexuality , and says sexual energy ( libido )
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