Pain and pleasure are two sides of the same coin. I read somewhere that during a torture, once the torturer sees the victim is actually enjoying the pain of the

Pain and pleasure are two sides of the same coin. I read somewhere that during a torture, once the torturer sees the victim is actually enjoying the pain of the torture then he/she has to end/kill him/her. I can understand why some people have dom/sub fetishes for the duality of pain and pleasure.