I know a LOT of gay people.  And every one of them was/is capable of loving people of the opposite sex.  But they chose to go with their sense of sexual lust, seeking a particular anatomy.  And really is a confused state of affairs because there's really nothing natural about the sort of behavior that is engaged in.  Where to "put things" when there is no designated orifice?  Well, wherever it fits, I suppose.

So I believe that anatomy should dictate who we decide to form partnerships with; that is, complementary anatomy.  When we fall for someone who is unavailable, whether it is an already married person or a person of the same sex, we move on.