Responding to "Homosexuality is wrong, the same way incest is wrong"

[GenericAthiest]

Imo why we don't like homosexuality is because if there where too many homosexuals the human species would be in danger of not being able to carry on our genes....this Is why I think human beings are not open to homosexuality....because its ingrained in us to be against it.

 We can't fear the straights who wont reproduce because we don't know which ones will ultimately produce and which ones wont.

It may be ingrained in us, but I think it's environmental learning and not genetic. Homosexual acts occur in other animals all the time without repercussions from other members of that species. Plus, if concern for population growth was the basis to 'fear' homosexuals then we should be just as 'afraid' of straights who never reproduce.