I have a libretarian streak in me and therefore I think that as long as no one's rights, life, or health are threatened by what two people do, the folks in the big white domed building don't have a say in it.

American are mature enough to make our own decisions and we don't need big brother telling us what is moral. (note that murder, rape, theft, etc. are still bad because they violate someone else's rights, consensual homosexuality does not)