I have 3 boys 2 of whom were castrated after puberty and so still have a sex drive. With one of them it's fine as he takes it out occasionally on an old pink duster. The other however tries to "hump" my duvet at least twice a night. No matter what I do I can't stop him. Does anyone have any ideas of how to stop him or divert him to something else (He used to use a teddy but unfortunately he stopped that) ?