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African-american male and female hands on bed, closeup Portrait of Caucasian male and Asian female having romance moment. Published date: Waldinger Sometimes people also have oral sex as part of foreplay. Sexual selection Sexual reproduction evolution reproductive system Courtship display sexual ornamentation handicap principle sexy son hypothesis Fisherian runaway Mating systems mate choice mating call mating plug lek mating Copulation cloacal kiss sexual intercourse pseudocopulation Fertilisation internal external sperm competition traumatic insemination penile spines Modes monogamy promiscuity polyandry polygyny polygynandry semelparity and iteroparity opportunistic hermaphroditism cuckoldry seasonal synchrony Sexual dimorphism anisogamy oogamy Bateman's principle bimaturism cannibalism coercion Sexual conflict interlocus intralocus Interspecies breeding Non-reproductive behavior Fisher's principle. Bruce, Bagemihl

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Various jurisdictions have placed restrictive laws against certain sexual acts, such as incestsexual activity with minorsprostitutionrapezoophiliasodomypremarital and extramarital sex.

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Promoting Healthy Behaviour: Weschler, Toni Sexual intercourse has traditionally been considered an essential part of a marriage, with many religious customs requiring consummation of the marriage and citing marriage as the most appropriate union for sexual reproduction procreation.

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