Sex. Feminism. BDSM. And some very, very naughty words.
It only hurts for a few minutes...Just make sure that he doesn't do it long enough to burn you. That sucks.
Try a dog shock collar instead. Its great for being trained.If you don't instantly comply its "ZAP" with no way to resist.
Actually, I quite like stun guns to the limbs. One on the back of my forearm makes my hand do the most amazing "Frankenstein waking up" impression...I haven't tried one elsewhere, but I guess I should...