You don't need to be attracted to a person to become sexually aroused. You can be straight as an arrow. If Butch, the 350lbs. gay bear gives you a beej you're going to become aroused whether you're repulsed or not. It's a physical reaction to the stimulation. You have little control over it. It's a lot like pain. You can resist pain, but only so much. So yes, a gay man who not even the least bit attracted to women can, in fact, have sex with them.
God, so atrocious in the Old Testament, so attractive in the New--the Jekyl and Hyde of sacred romance.
-Mark Twain
If people are good only because they fear punishment and hope for reward, then we are a sorry lot indeed.
-Albert Einstein