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In page Sexual intercourse:
"Bonobos, chimpanzees and dolphins are species known to engage in heterosexual behaviors even when the female is not in estrus, which is a point in her reproductive cycle suitable for successful impregnation. These species are also known to engage in same-sex sexual behaviors.[10] In these animals, the use of sexual intercourse has evolved beyond reproduction to apparently serve additional social functions (such as bonding).[11]
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