In my convention talk, this statement got by far the strongest response.
"Homophobia, for many people, is rooted in guilt and anxiety about their own MASTURBATORY behavior and in the shame they feel about their own bodies." It is among the strongest challenges to religionists. Try using it on someone and see how they respond. Even if they vehemently disagree, there is no doubt that they will think about it the next time they masturbate. It is the most intimate thing you can do with yourself, the one thing religionists are most afraid of and cannot openly deal with. As a result, they externalize it by demonizing those who aren't ashamed of their sexuality. Have great sex with yourself.