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Copulation corresponds to a succession of innate sexual reflexes: erection, vaginal lubrication, lordosis behavior, immobilization, intromission, pelvic thrust and ejaculation.These copulatory reflexes are controlled by hormones and facilitated by sexual pheromones.In humans and bonobos, the female undergoes relatively concealed ovulation so that male and female partners commonly do not know whether she is fertile at any given moment.
A 1999 study by the Kinsey Institute examined the definition of sex based on a 1991 random sample of 599 college students from 29 U. states; it reported that while "virtually every college student they surveyed considered penile–vaginal intercourse to be sex," and 19–20% said that anal intercourse was not sex, 60% said oral-genital contact (fellatio, cunnilingus) did not constitute having sex.
Unlike mammalian copulation, where copulation is a reflex controlled by hormones and influenced by pheromones, human sexual intercourse is mostly a voluntary and learned activity that is performed in order to obtain sexual rewards (i.e., pleasure or procreation).
During coitus, the partners orient their hips to allow the penis to move back and forth in the vagina to cause friction, typically without fully removing the penis.
For most non-human mammals, mating and copulation occur at the point of estrus (the most fertile period of time in the female's reproductive cycle), which increases the chances of successful impregnation.
Sexual intercourse may be defined by different words, including coitus, copulation, coition, or intercourse (which is typically shorthand for sexual intercourse).Learner and Steinberg attribute researchers' focus on penile–vaginal sex to "the larger culture's preoccupation with this form of sexual activity," and have expressed concern that the "widespread, unquestioned equation of penile–vaginal intercourse with sex reflects a failure to examine systematically 'whether the respondent's understanding of the question [about sexual activity] matches what the researcher had in mind'".It may also be that conceptually conflating sexual activity with vaginal intercourse and sexual function hinders and limits information about sexual behavior that non-heterosexual people may be engaging in, or information about heterosexuals who may be engaging in non–vaginal sexual activity.Virginity loss is often based on penile–vaginal intercourse partly because heterosexual couples may engage in anal or oral sex not only for sexual pleasure, but as ways of maintaining that they are virgins if they have not engaged in the reproductive act of coitus.