A recent study published in the journal Animal Behavior has demonstrated that homosexual behavior has evolved in humans and animals. The study, conducted by researchers from the University of Cambridge and the University of Exeter, found that homosexual behavior is common in a variety of species, and is often seen as an adaptive trait. This suggests that homosexual behavior is likely to have evolved in humans and animals as a way of increasing reproductive success, rather than as a byproduct of other evolutionary processes. The study also showed that there is a strong correlation between homosexuality and the level of testosterone in the blood, which suggests that hormones play an important role in the evolution of homosexual behavior.

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source: Phys.org