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Sexual intercourse or copulation is the union of the sex organs of two sexually reproducing animals. The two entities may be of opposite sexes, or they may be hermaphroditic, as is the case with snails. However, the term sex, in the context of sexual intimacy, is usually understood more widely to normally include any mutual genital stimulation, such as oral sex and anal sex.
For most non-human animals, sexual intercourse is used only for reproduction, through insemination and subsequent internal fertilization. However, bonobos, dolphins, and chimpanzees are known to engage in sexual intercourse even when the female is not in estrus, the most fertile period of time in the female's reproductive cycle, and to engage in sex acts with samesex partners. In most instances, humans have sex primarily for pleasure. This behavior in the above mentioned animals is also presumed to be for pleasure, which in turn strengthens social bonds. (...) more....
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