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As adults, they have different reproductive mechanisms that enable them to perform sexual acts and to reproduce.

The biological aspects of humans' 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, Males and females are anatomically similar; this extends to some degree to the development of the reproductive system.The four important sexual hormones are oxytocin, prolactin, follicle-stimulating hormone, and luteinizing hormone.Males also have both internal and external genitalia that are responsible for procreation and sexual intercourse.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 the hypothalamus and itself.His instinct theory said humans are driven from birth by the desire to acquire and enhance bodily pleasures, thus supporting the nature debate.Freud redefined the term sexuality to make it cover any form of pleasure that can be derived from the human body.Psychological theories exist regarding 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 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.