I don't know why you're sure of that opinion: it is well beyond current scientific evidentiary support. And sex in some species (e.g. ducks) appears deeply unpl

I don't know why you're sure of that opinion: it is well beyond current scientific evidentiary support. And sex in some species (e.g. ducks) appears deeply unpleasurable for at least one of the participants. But homosexual behavior is widespread across animal species, which does undermine the parent's case.