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A new study has found that same-sex intimacy is expressed by nearly 60 primate species, including baboons and chimpanzees.
The research, which analysed 491 non-human primates, identified same-sex sexual behaviour in 59 species, with repeated occurrences in 23.
Same-sex intimacy is more prevalent in primate species living in harsh environments, those facing high predation risks, or those with complex social structures and hierarchies.
Scientists suggest this behaviour may help primates manage group dynamics, facilitate competitive scenarios, and maintain group harmony in stressful situations.
The findings indicate that homosexuality is not solely driven by genetics or a single environmental factor, but rather emerges from complex interactions.