[dhs12345]

Interesting.

Also one would think that if it were genetic, the fact that gays are less likely procreate means that the odds are stacked against them and their “genetic” trait.

And eventually, after several generations and through natural selection, the homosexual gene would become nonexistent.

[FredZarguna]

Right, but remember a number of genetic traits continue to propagate throughout time despite their intuitive unlikeliness of transmission. Trisomy 21, referenced elsewhere on this thread (Down Syndrome) is a "genetic" disorder although no specific gene is involved. Its victims are typically unlikely to reproduce, yet it has not gone away.

However, there are problems with a theory that homosexuality could be the result of structural defects introduced in the haploids of the mother or father: we simply don't see individuals with identical genetic material raised apart as being 100% correlated. As a matter of fact, in the case of identical female twins raised apart, there are no known cases where one female lesbian has a lesbian twin. None.