The largest study of its kind found new evidence that genes contribute to same-sex sexual behavior, but it echoes research that says there are no specific genes that make people gay.
The genome-wide research on DNA from nearly half a million U.S. and U.K. adults identified five genetic variants not previously linked with gay or lesbian sexuality. The variants were more common in people who reported ever having had a same-sex sexual partner. That includes people whose partners were exclusively of the same sex and those who mostly reported heterosexual behavior.
"We also found that it's effectively impossible to predict an individual's sexual behavior from their genome. Genetics is less than half of this story for sexual behavior but it's still a very important contributing factor," Neale said. Importantly, most participants were asked about frequency of same-sex sexual behavior but not if they self-identified as gay or lesbian. Fewer than 5% of U.K. participants and about 19% of U.S. participants reported ever having a same-sex sexual experience.
A Science commentary notes that the five identified variants had such a weak effect on behavior that using the results"for prediction, intervention or a supposed 'cure' is wholly and unreservedly impossible."
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