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Socio-cultural aspects of sexuality include historical developments and religious beliefs.

Examples of these include Jewish views on sexual pleasure within marriage and some views of other religions on avoidance of sexual pleasures.

Women have a monthly reproductive cycle, whereas the male sperm production cycle is more continuous.

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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.

Observed gender differences regarding the number of sexual partners are modest, with males tending to have slightly more than females.

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.

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 raised rim at the border of the shaft and glans is called the corona.

The urethra runs through the shaft, providing an exit for sperm and urine.

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.

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