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Study shows same-sex sexual behavior is widespread and heritable in macaque monkeys
Homosexual behavior is widespread among male macaque monkeys in the wild, and it may provide evolutionary advantages such as strong male alliances and increased access to females.
In a study on a colony of rhesus macaques in Puerto Rico, researchers found that 72% of males engaged in same-sex mounting, while only 46% mounted females. Same-sex mounting was found to be heritable, with genetics accounting for 6.4% of the behavior.
Contrary to previous beliefs, same-sex behavior in male monkeys did not negatively impact reproductive success.