"In principle there is a difference between violence which is incidental and violence which is inflicted for the indulgence of cruelty. The violence of sadomasochistic encounters involves the indulgence of cruelty by sadists and the degradation of victims. Such violence is injurious to the participants and unpredictably dangerous. I am not prepared to invent a defence of consent for sadomasochistic encounters which breed and glorify cruelty . . . . Society is entitled and bound to protect itself against a cult of violence. Pleasure derived from the infliction of pain is an evil thing. Cruelty is uncivilized."