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All the evidence we have from monozygotic twins raised apart says that lesbianism is 100% environmental. [That's right: NO study of female identical twins raised apart has ever found a case where a lesbian had a twin sister who was also a lesbian.]

For males, I believe the correlation was 0.47, which suggests that there is both a strong genetic and a strong learned component.

It is shocking how many Millenials believe that it's been scientifically established that homosexuality is completely genetic. Nothing could be further from the truth. Not much science has been done, but the science that has been done doesn't suggest a homosexual genetic destiny AT ALL.