Now you are making another argument. You lumped beastiality and pedapheila (or was it adultry?) with homosexuality. So I highlighted one difference. I don’t recall Jesus saying anything about homosexuality one way or the other.
Polygamy is not by itself a sin or inherently immoral. If it were, it would have been immoral during biblical times as well as today. It is an excellent example, however, for the belief that what is moral can change over time, especially in the arena of sexual relations. If polygamy can go from acceptance to immoral, then why cannot homosexuality go from immoral to accepted?
Is the gift of sexual intercourse only for procreative funcitons. Should not a married couple be entitled to find sexual gratification with each other in a variety of ways? How is it a misue of the unitive function of sex?
The bible itself does not seem to focus on what goes on between two people nearly as much as people who read the bible tend to focus on these things.