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There is a genetic predisposition, though, because identical twins are more likely to be of the same sexual orientation than fraternal ones. The genetic component is not the main factor, though, and even less so for women than men.

I don't know enough of the science. Do identical twins have exactly the same DNA? If so, then just using logic if you had any cases where one twin was homosexual and one was not, then you'd have to argue that none of those cases were genetic in order to preserve the notion that it's genetic. So I guess even identical twins where one is homosexual and one is not still does not prove that homosexuality is not genetic. The funny thing is that if there is a homosexual gene then natural selection seems to have failed. Unless the homosexual gene was passed down because the behavior was so frowned upon in the past, that they still participated in normal procreation to conform to normal standards. So actually, if the gene does exist, we should see homosexuality dying out since it it is now an approved behavior. That is homosexuals are no longer under societal pressure to procreate normally. Therefore, the prevalence of the gene should begin to fade. Hmm. Maybe I should be for gay marriage. The more they marry each other, the sooner they're gone. I guess the flaw in that argument is that many of them use their own genetic material to produce designer babies. So we'll probably see more homosexuals since the DNA is spreading using current reproductive technology.