Well my lionheads won't hump at all. Smudge would like to but Nutmeg always sets him straight, she won't even let him get close when he's in that mood. When Mini does it to Mischa he gets annoyed but he gets annoyed when she does it the right way as well, I think cos she nips and holds on. Mischa rarely head humps, he normally gets it the right way round but doesn't do it much anymore.