'So your point only applies if humans are naturally polygamous, which they don't appear to be.'

see here is the point on the one hand you say that homosexuality should be allowed because it is natural to animals thus it should be natural to us on the other hand you say that humans don't appear to be naturally polygamous, so in effect you are hinting at the fact that animal and human nature differ.

So how come you support homosexuality in humans because it is natural to animals and not support polygamy even though it is natural to animals but you get the point.

Thus the hypocrisy