Decades ago, before the Human Genome project, there was speculation there might be a gay gene. While some applauded the idea - sexuality wasn't a choice - others were concerned that future science might start switching such genes off.
Neither extreme turned out to be valid and
a new study affirms what scientists have long said; there is no "gay" gene. The genome-wide association in
Science used 477,522 people, 26,827 reported same-sex sexual behavior. Even when all tested genetic variants were taken into account, they collectively accounted for no more than a quarter of the same-sex behavior reported by the study participants.