Scientists reveal drivers of homosexual behaviour in primates

Researchers report that same-sex sexual behaviour is widespread across animals, including primates, and has been observed in more than 1,500 species; recent work suggests it can be partly inherited and may offer evolutionary benefits.

Scientists report new findings on what drives same-sex sexual behaviour in primates. More than 1,500 different species have been observed engaging in same-sex sexual behaviour, and descriptions of the phenomenon go back to Aristotle. For many years this behaviour was described as a "Darwinian paradox" because it does not directly pass genes to offspring. Recent research is reported to show the behaviour can be partly inherited and may provide evolutionary advantages, researchers said. Key findings: - Same-sex sexual behaviour has been recorded in over 1,500 species. - Historical accounts of such behaviour date back to the time of Aristotle. - The behaviour was long labelled a "Darwinian paradox" by some scientists. - Recent studies suggest partial inheritance of the behaviour. - Researchers report the behaviour can provide evolutionary or social benefits, and Imperial College biologist Vincent Savolainen said diversity of sexual behaviour is common and important in nature. Summary: These findings frame same-sex sexual behaviour as a widespread natural trait with possible heritable and evolutionary roles. They address earlier views that the behaviour was evolutionarily puzzling. Undetermined at this time.