I suspect it's the fact that he can explain, at length and in detail, why unconditional support of unrestricted sexual activity is not a good thing, and libertarians and most conservatives are embarrassed to, unable to, don't want to, or just plain won't pass judgement on those who wish to... well, do things like have sex with a chain link fence if the impulse strikes. Ratcheted down, that's a logical conclusion of contemporary ethical pre-suppositions.