“The idea that a single gene might be responsible for sexual behaviour—or, indeed, any other psychological trait—has since been discredited and we now know that human behaviour is influenced by many genes, each having a small effect.”
“The authors of a study involving almost half-a-million concluded that genetics can explain between 8% and 25% of the variation in same-sex sexual behaviour.”
There is No ‘Gay Gene,’ but Sexuality is Affected by Many Genes of Small Effect |
More recent discussions on etiology are more enlightening, of course 💡
There is No ‘Gay Gene,’ but Sexuality is Affected by Many Genes of Small Effect - Quillette