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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. 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. Biological function The desire for sensual pleasure is usually the main motivation for humans, and sometimes the wish to have a baby or more children. 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.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. Without contraceptives, during a woman's fertile days, in there is a relatively high probability that contraception 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. Worldwide, about 57 per cent of couples with women of reproductive age use modern methods of contraception.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. 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.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. Legal situation 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. Psychological aspects A desire for pleasure is a natural motivation for sex in general. Human intimacy favours a pleasurable experience. For people who prefer non-committal sex, emotional closeness plays a lesser role. In studies consensual vaginal intercourse has been associated with signs of better physiological and psychological functions. In women, regular orgasms during vaginal sex correlate positively with passion, love and relationship quality.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. 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. 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.In 2006, the WHO reported a worldwide prevalence of between 8% and 21.1% of painful vaginal sex for women. 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. 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. 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. 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.” Description In all mammals including humans, penile penetration of.... Discover the Rebekah Dodson popular books. Find the top 100 most popular Rebekah Dodson books.