I'm thinking it would be the same way that they regulate "human-animal-sex attraction."
To start, don't put up the poster of Lassie, or Mr. Ed's, crotch next to the Coors Girls in your room. If you are a guy, don't brag publicly about how much you want to drive the dirt road with Tom Cuise. Pretty simple rules.
I was assuming that it would already be uncommon for any priests who had unacted upon homosexual urges to have gay pin ups on their walls, but who knows!