Part of a series on |
Sex |
---|
Biological terms |
Sexual reproduction |
Sexuality |
Sexual system |
Penile-vaginal intercourse or vaginal intercourse is a form of penetrative sexual intercourse in human sexuality, in which an erect penis is inserted into a vagina. [1] Synonyms are: vaginal sex, cohabitation, coitus (Latin: coitus per vaginam), (in elegant colloquial language) intimacy, or (poetic) lovemaking. (Some of the synonyms are used for other variants of sexual intercourse as well.) It corresponds to mating or copulation in non-human animals.
Various sex positions can be used. Following insertion, additional stimulation is often achieved through rhythmic pelvic thrusting or a gyration of the hips, among other techniques. The biological imperative is to achieve male ejaculation so that sperm can enter the female reproductive tract and fertilize the egg, thus beginning the next stage in human reproduction, pregnancy.
The desire for sensual pleasure is usually the main motivation for humans, and sometimes the wish to have a baby or more children. [2] [3] The biological function of vaginal intercourse is human reproduction. During coitus without condom, sperms enter the vagina, first with the pre-ejaculate and then a larger amount through male ejaculation. [4]
Sperm swim through the cervix and the uterus into the fallopian tubes of the woman. If they meet a fertilisable egg cell after or during an ovulation, or if an ovulation occurs hours or days later, one sperm can fertilize it. The resulting zygote develops into the early embryonic stages and, in the meantime, migrates from the fallopian tube into the uterus. The nidation of the embryo called blastocyst at this stage of development with the beginning of the production of hCG marks the beginning of a pregnancy. [5] Without contraceptives, during a woman's fertile days, there is a relatively high probability that conception will follow.
For people who do not want (another) child, contraception has made it possible to separate vaginal intercourse from its biological function of procreation. [6] [7] [ page needed ] [8] Worldwide, about 57 per cent of couples with women of reproductive age use modern methods of contraception. [9]
Since there is no mating season (estrus) in humans, the partners can have penile-vaginal intercourse distributed over the menstrual cycle regardless of the time of ovulation, even when the woman is already pregnant and after the menopause. [10] [11] The principles of safer sex eliminate the reproductive function. Couples who wish to have offspring can avail themselves of the tests for sexually transmitted infections recommended by the WHO, so that after ruling out or treating any detected infection they can have penile-vaginal intercourse without using a condom. [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [ excessive citations ]
There are currently more than 7.5 billion people (World Population 8 billion) whose biological parents conceived this way. The increasing proportion of people conceived through intrauterine insemination and in vitro fertilisation is still comparatively small.
Vaginal intercourse between private individuals is part of their private sphere. Sexual intercourse between an adult and a young person is generally only permitted after the age of consent in the respective country has been reached, though some countries/jurisdictions have special exceptions to this rule. These exceptions may include when the minor is legally married to the adult or within no more than a specified age gap with the adult. Nowadays intimate intercourse between unmarried teenagers is permitted and common in many countries, but not in Muslim culture. Lack of sexual education about contraception often leads to teenage pregnancy. In many countries, after marriage, the first cohabitation is considered a (sexual) "consummation of marriage". In countries with Sharia, the religious regulations from the Koran, which prohibit any sexual activity with a person to whom one is not married, are a part of the legislation. In every country of the world vaginal intercourse performed without the consent of the other person constitutes rape.[ citation needed ]
A desire for pleasure is a natural motivation for sex in general. [22] Human intimacy favours a pleasurable experience. [23] For people who prefer non-committal sex, emotional closeness plays a lesser role. [24] [25] [26] [27] [28] [29] [30] [31] [32] In studies consensual vaginal intercourse has been associated with signs of better physiological and psychological functions. [33] In women, regular orgasms during vaginal sex correlate positively with passion, love and relationship quality. [34]
In experimental studies with men and women whose hormone levels were examined, one having vaginal intercourse and the other self-pleasuring to orgasm, it was found that in both sexes the increase in prolactin was 400% higher after vaginal intercourse than after masturbation. This is interpreted to mean that vaginal intercourse is physiologically more satisfying. [35] [36] In satisfying relationships, positive effects on health and well-being have been proven. One study (2012) showed a stress reduction effect for both partners in satisfying relationships, but not in unsatisfactory relationships. [37] [38] As preliminary for the natural procreation of a new human being, for females penile-vaginal intercourse is connected with various attributes like psychological onto sacramental aspects beyond the reproductive function. Sometimes sex is also driven by motives like to degrade, to punish or to overcome loneliness and boredom. [39]
In 2006, the WHO reported a worldwide prevalence of between 8% and 21.1% of painful vaginal sex for women. [40] In a U.S. study, about 30% of women and 7% of men reported pain, for most only mild and of short duration. This study found that a large percentage of Americans do not talk about the pain with their partner. [41] [42] In a Swedish study of young women aged 18 to 22, as many as 47% reported pain, but they said they did not want to interrupt the sex act. Some pretended to enjoy it instead of giving the man any feedback. The most common reason was that they put the man's pleasure above their own and tended toward submissiveness during sex. [43] Data from an online survey in the United States suggest that a proportion of men engage in sexual behaviours described as dominant and purposeful, in which they mimic behaviors seen in porn. [44] Unless a woman's pain has a physical cause, it is often related to impatient partner action or lack of open communication. The prevention of sexual disappointment and dyspareunia caused by the behaviour of the male partner is summarized by Betty Dodson in the following words:
“It’s a pleasure to be with a man who is self-assured, confident in his ability to get erect and maintain his erection long enough to enjoy the dance of erotic love. If he’s not a cocksman, he has mastered oral and manual skills. He has a sensitive touch and never hesitates to ask how I like my clitoris touched. He is never in a hurry. Before touching my clitoris, he always applies some kind of lubrication. When entering my vagina, he savours slow penetration.” [45]
In all mammals including humans, penile penetration of the vagina is an instinctual behaviour serving the continuation of the species. [46] [47] In humans, learned behaviour also plays an important role (sexual scripts). [48] From Shere Hite, there is the suggestion to define onset not by penetration, but by the covering of the vulva by the penis. [49]
Preparation for vaginal coitus usually involves foreplay in the form of caresses, petting, manual sex and/or oral sex. For the woman, physical sexual arousal and clitoral erection resulting from the foreplay are the prerequisites for the reaction of the intravaginal G-spot.
The sex positions, the pelvic movements of the woman and the man, how slowly or quickly they are performed and the lesser or greater depth have an influence on the two arousal curves. Duration can be influenced by positions, gentle or stronger movements, and by touching erogenous zones with the hands. [50] The needs for movements are individually different for both women and men. [51] [52] For women, pelvic floor training and active movements of their pelvis during vaginal intercourse increase the chance of orgasm. [53] [54] A man's arousal curve usually rises faster, while women need plenty of time. [55] According to an investigation of 2005 the time from penile insertion to male orgasm, the intravaginal ejaculation latency time (IELT), varies between 0.55 and 44.1 minutes. [56] Sexually experienced men use delaying techniques to give their female partner the time she needs. Most men can learn to intentionally delay their own arousal and orgasm by practicing this doing masturbation. [57] [58] [59] [60] The reason why men are faster by nature:
In a man, his glans penis is constantly enveloped by the vagina, it is continuously stimulated, making it likely that moving in and out will cause him to have an orgasm relatively soon.
In women, the glans clitoridis lies in a distance to the vaginal entrance often without physical contact. [61]
The clitoral glans has an essential function in triggering sexual arousal and then orgasm, [62] For many women, the movement of the penis in the vagina causes only a limited increase in their arousal. Many women reach orgasm when both the extravaginally located parts of the clitoris and the erogenous zones inside the vagina are continuously stimulated simultaneously for long enough. Sexual arousal can increase to the point where one or both partners experience an orgasm either in succession, or simultaneously. The hypothesis of two modes of female orgasm - "vaginal" or "clitoral" - is not tenable. Rather, it is a complex reaction in which all organ systems of the human body are involved. [63] [64] [65] Without clitoral stimulation, 23.3% of women reach orgasm during vaginal intercourse, with simultaneous clitoral stimulation 74%. [66]
When the man is sitting upright with the woman sitting on his lap, she can rub her clitoris against his pubic bone. [67] In lateral coital position there are also possibilities for clitoral stimulation while the penis is moving inside. In the Flanquette position, the man can give some pressure with his thigh to her mons pubis and the clitoral glans.
Another variation of vaginal sex is with lesbians who use a single or double-sided dildo. [68]
In a woman with an intact moist vaginal mucosa, friction by the penis is painless. In case of insufficient vaginal lubrication or excessive temporal extension of the coitus, the mucous membranes may become sore due to mechanical irritation. [69] If sand gets into the vagina on a beach or in an unclean dwelling, small abrasions occur in the vagina and on the glans penis. A vaginal douche has physiological disadvantages. [70] The sand is excreted by the natural self-cleaning of the mucous membrane.
The length of the stretched vagina varies from person to person. The mean value is 13 cm (+ - 3 cm) which corresponds to the average length of the human penis. At rest, the vagina is considerably shorter. In a study from 1993, the mean value was given as 9.2 cm, in a study from 2006 only 6.27 cm with a variation of the lengths between 4.1 and 9.5 cm. [71] [72] If the woman is not sufficiently aroused with a deep penetration the penis bumps against the cervix causing pain. If the stretching capacity of the vagina is exceeded by a too large penis, pain and inflammation will result. The same problem can occur with a relatively short vagina. The remedy in both situations is to be mindful of the time for clitoral stimulation by foreplay and to avoid penetrating too deeply. [73] A comparative study between women who had consensual vaginal sex and victims of rape found that in consensual sex, 6.9 percent of women had genital injuries. Among women who were raped, 22.8 percent suffered genital injuries. [74]
In men, there is a risk of penile rupture if the penis is bent when erect. This is a case of medical emergency. [75] [76] [77] According to studies (2017 and 2022), accidents in which the man suffers a penile fracture occur predominantly in the doggy style position, but a careless movement by the woman on top can also inflict such a serious injury on the man. [78] [79] One of the causes is the penis slipping out of the vagina and, during the next thrusting movement, forcefully hitting an area of the vulva under which her pubis bone and the pubic symphysis are, when the penis suddenly gets bent downwards. In the missionary position such accidents are rare. Unsuitable angles and changes of position of one or both partners can also lead to severe misstrain of the penile corpus cavernosum and thus to a penile rupture. [80] [81] [82]
In 2021, a study of 3017 American women identified the ways women have discovered to make vaginal sex with a male partner more pleasurable and arousing for themselves.
The knowledge of such techniques enables women to communicate their preferences to their partners. [84] Pairing has been tested successfully since the 1970s by Betty Dodson in her coachings for women suffering from anorgasmia by using a dildo to penetrate the vagina and a vibrator to place next to the clitoral glans. The other techniques were also part of her coaching for women who wished to experience orgasm during vaginal intercourse as much as their partner.
Menstrual cramps, hygienic or cultural reasons may condition abstinence during menstruation. [85] A necessity for painless intimate intercourse is vaginal lubrication. In women with vaginal aplasia, a neovagina can be surgically created by vaginoplasty. In men, the prerequisite is a painless penis and the ability to have an erection. [86] [87]
An investigation by the Charité Berlin (2002) found that, for women, the partner's smell had the first effect on stimulating or inhibiting pleasure, followed by mood, personal hygiene, clitoral stimulation and safety from disease. Attractiveness and penis length played a subordinate role. [88] Women generally respond more to olfactory perception, men more to visual perceptions. [89]
A variety of factors can lead to discomfort or pain (see dyspareunia). [90] Specialists in gynaecology are responsible for treatment in women; specialists in urology and dermatology are responsible for treatment in men.
For people with physical impairments (disability), sex positions that do not cause discomfort are usually possible. In a study of patients with chronic lumbar spine pain, 81 per cent complained of sexual problems, and 66 per cent never talked about the issue with their physician. [91] [92]
Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure. Other forms of anal sex include anal fingering, the use of sex toys, anilingus, pegging, as well as electrostimulation and erotic torture such as figging. Although anal sex most commonly means penile–anal penetration, sources sometimes use anal intercourse to exclusively denote penile–anal penetration, and anal sex to denote any form of anal sexual activity, especially between pairings as opposed to anal masturbation.
In amniotes, the clitoris is a female sex organ. In humans, it is the vulva's most erogenous area and generally the primary anatomical source of female sexual pleasure. The clitoris is a complex structure, and its size and sensitivity can vary. The visible portion, the glans, of the clitoris is typically roughly the size and shape of a pea and is estimated to have at least 8,000 sensory nerve endings.
Orgasm or sexual climax is the sudden discharge of accumulated sexual excitement during the sexual response cycle, resulting in rhythmic, involuntary muscular contractions in the pelvic region characterized by sexual pleasure. Experienced by males and females, orgasms are controlled by the involuntary or autonomic nervous system. They are usually associated with involuntary actions, including muscular spasms in multiple areas of the body, a general euphoric sensation, and, frequently, body movements and vocalizations. The period after orgasm is typically a relaxing experience, attributed to the release of the neurohormones oxytocin and prolactin as well as endorphins.
Sexual intercourse is sexual activity involving the insertion and thrusting of the male penis inside the female vagina for sexual pleasure, reproduction, or both. This is also known as vaginal intercourse or vaginal sex. Sexual penetration has been known by humans since the dawn of time, and has been an instinctive form of sexual behaviour and psychology among humans. Other forms of penetrative sexual intercourse include anal sex, oral sex, fingering and penetration by use of a dildo, and vibrators. These activities involve physical intimacy between two or more people and are usually used among humans solely for physical or emotional pleasure. They can contribute to human bonding.
The G-spot, also called the Gräfenberg spot, is characterized as an erogenous area of the vagina that, when stimulated, may lead to strong sexual arousal, powerful orgasms and potential female ejaculation. It is typically reported to be located 5–8 cm (2–3 in) up the front (anterior) vaginal wall between the vaginal opening and the urethra and is a sensitive area that may be part of the female prostate.
The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and spreads her legs and a man lies on top of her while they face each other and engage in vaginal intercourse. The position may also be used for other sexual activity, such as anal sex. It is commonly associated with heterosexual sexual activity, but is also used by same-sex couples. It may involve sexual penetration or non-penetrative sex, and its penile-vaginal aspect is an example of ventro-ventral (front-to-front) reproductive activity. Variations of the position allow varying degrees of clitoral stimulation, depth of penetration, participation on the part of the woman, and the likelihood and speed of orgasm.
Doggy style is a sex position in which one participant bends over, crouches on all fours, or lies on their abdomen, for sexual intercourse, other forms of sexual penetration or other sexual activity. Doggy style is a form of a rear-entry position, others being with the receiving partner lying on the side in the spoons sex position or the reverse cowgirl sex position. Non-penetrative sex in this position may also be regarded as doggy style.
Dyspareunia is painful sexual intercourse due to medical or psychological causes. The term dyspareunia covers both female dyspareunia and male dyspareunia, but many discussions that use the term without further specification concern the female type, which is more common than the male type. In females, the pain can primarily be on the external surface of the genitalia, or deeper in the pelvis upon deep pressure against the cervix. Medically, dyspareunia is a pelvic floor dysfunction and is frequently underdiagnosed. It can affect a small portion of the vulva or vagina or be felt all over the surface. Understanding the duration, location, and nature of the pain is important in identifying the causes of the pain.
An erogenous zone is an area of the human body that has heightened sensitivity, the stimulation of which may generate a sexual response, such as relaxation, sexual fantasies, sexual arousal and orgasm.
Sexual stimulation is any stimulus that leads to, enhances and maintains sexual arousal, and may lead to orgasm. Although sexual arousal may arise without physical stimulation, achieving orgasm usually requires it.
Persistent genital arousal disorder (PGAD), originally called persistent sexual arousal syndrome (PSAS), is spontaneous, persistent, unwanted and uncontrollable genital arousal in the absence of sexual stimulation or sexual desire, and is typically not relieved by orgasm. Instead, multiple orgasms over hours or days may be required for relief.
Fingering is sexual stimulation of the vulva or vagina by using the fingers. Vaginal fingering is legally and medically called digital penetration or digital penetration of the vagina. The term "digital" takes its significance from the English word 'digit', which refers to a finger, thumb, or toe. Fingering may also include the use of fingers to stimulate the anus.
A vibrator, sometimes described as a massager, is a sex toy that is used on the body to produce pleasurable sexual stimulation. There are many different shapes and models of vibrators. Most modern vibrators contain an electric-powered device which pulsates or throbs. Vibrators can be used for both solo play and partnered play by one or more people. Devices exist to be used by couples to stimulate the genitals of both partners. They can be applied to erogenous zones, such as the vulva, vagina, penis, scrotum, or anus, for sexual stimulation, for the release of sexual frustration and to achieve orgasm. Vibrators may be recommended by sex therapists for women who have difficulty reaching orgasm through masturbation or intercourse.
A G-spot vibrator is a sex toy with female and male varieties. The female version of the device is built to massage the G-spot, described as a bean-shaped area of the vagina. Some women report that it is an erogenous zone which, when stimulated, can lead to strong sexual arousal, powerful orgasms and female ejaculation. The male version of the G-spot vibrator is used for massaging the prostate for both sexual and health-related reasons.
Non-penetrative sex or outercourse is sexual activity that usually does not include sexual penetration. It generally excludes the penetrative aspects of vaginal, anal, or oral sex, but includes various forms of sexual and non-sexual activity, such as frottage, manual sex, mutual masturbation, kissing, or cuddling. Some forms of non-penetrative sex, particularly when termed outercourse, include penetrative aspects, such as penetration that may result from forms of fingering or oral sex.
Human female sexuality encompasses a broad range of behaviors and processes, including female sexual identity and sexual behavior, the physiological, psychological, social, cultural, political, and spiritual or religious aspects of sexual activity. Various aspects and dimensions of female sexuality, as a part of human sexuality, have also been addressed by principles of ethics, morality, and theology. In almost any historical era and culture, the arts, including literary and visual arts, as well as popular culture, present a substantial portion of a given society's views on human sexuality, which includes both implicit (covert) and explicit (overt) aspects and manifestations of feminine sexuality and behavior.
Clitoral erection is a physiological phenomenon where the clitoris becomes enlarged and firm.
In mammals, the vulva consists of the external female genitalia. The human vulva includes the mons pubis, labia majora, labia minora, clitoris, vulval vestibule, urinary meatus, the vaginal opening, hymen, and Bartholin's and Skene's vestibular glands. The urinary meatus is also included as it opens into the vulval vestibule. The vulva includes the entrance to the vagina, which leads to the uterus, and provides a double layer of protection for this by the folds of the outer and inner labia. Pelvic floor muscles support the structures of the vulva. Other muscles of the urogenital triangle also give support.
The mechanics of human sexuality or mechanics of sex, or more formally the biomechanics of human sexuality, is the study of the mechanics related to human sexual activity. Examples of topics include the biomechanical study of the strength of vaginal tissues and the biomechanics of male erectile function. The mechanics of sex under limit circumstances, such as sexual activity at zero-gravity in outer space, are also being studied.
Sexual arousal describes the physiological and psychological responses in preparation for sexual intercourse or when exposed to sexual stimuli. A number of physiological responses occur in the body and mind as preparation for sexual intercourse, and continue during intercourse. Male arousal will lead to an erection, and in female arousal, the body's response is engorged sexual tissues such as nipples, clitoris, vaginal walls, and vaginal lubrication.