A new study conducted by scientists from the University of Exeter and the Zoological Society of London has revealed that same-gender sexual behavior is much more widespread among mammals than was previously thought. The research, which involved analyzing data from over 1,500 species of mammals, found that same-gender sexual behavior occurs in around one third of all species studied. This suggests that it is an evolutionary behavior that has been around for millions of years. The study also found that same-gender sexual behavior is more commonly found in species with a higher degree of social complexity, such as primates. This finding indicates that same-gender sexual behavior may have evolved as a means to strengthen social bonds and facilitate cooperation among members of the same species.

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source: Phys.org