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Some cultures have been described as sexually repressive.

The study of sexuality also includes human identity within social groups, sexually transmitted infections (STIs/STDs), and birth control methods.

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Production of spermatozoa (sperm) is also cyclic, but unlike the female ovulation cycle, the sperm production cycle is constantly producing millions of sperm daily.

The shaft of the penis consists of three cylindrical bodies of spongy tissue filled with blood vessels along its length.

This is a small area at the base of the brain consisting of several groups of nerve cell bodies that receives input from the limbic system.

Studies have shown that within lab animals, destruction of certain areas of the hypothalamus causes the elimination of sexual behavior.

Two well-known schools in psychology took opposing positions in the nature-versus-nurture debate: the Psychoanalytic school led by Sigmund Freud and the Behaviorist school which traces its origins to John Locke. He was a firm supporter of the nature argument; he said there are a large number of instincts but they are reduced into two broad groups: Eros (the life instinct), which comprises the self-preserving and erotic instincts, and Thanatos (the death instinct), which comprises instincts invoking aggression, self-destruction, and cruelty.

He gave sexual drives a centrality in human life, actions, and behaviors that had not been accepted before his proposal.

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.

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.

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