just a question that puzzled me since those who say that homosexuality is genetic and not a behavior choice are also usually strong evolutionists. it would seem to me that this gene would be getting less prevalent not more prevalent as the human species continues to evolve but apparently that's not necessarily the case. hopefully, it won't continue to multiple to such an extent that the whole human race is homosexual - although that would solve the "population explosion" problem and alleviate the need for so many abortions.
Whatever genetic component homosexuality has, the expression of it has changed quite a bit just in historical times. It's not an all or nothing proposition. There is no reason someone with homosexual proclivities can't have children. They can have heterosexual sex to procreate, and on the side have homosexual sex. It's almost never been 100% one way.