"I believe that the only problem with homosexuality is that even in theory it is impossible to maintain the human race."
Not really. Sexual orientation is not linked to fertility. If, by any chance, homosexual individuals could outnumber heterosexual individuals, selection (in this case, sexual selection) would most likely favor heterosexual individuals because they simply leave more offspring.
I belive you misunderstood what i was trying to say. What I meant was that if every single person in the world was homosexual nobody would have kids.
I understood just fine. What I said is also that this scenario is very unlikely to happen!