If the guy finds pain to be an aphrodisiac, then it works for him. I have fantasized about being tied up and used that way, but I don't know if I could actually cross that line. It would certainly have to be with a very experienced man who can sense limits and knows how far one could safely push past what the bottom thinks his limits are. The guy holding the whip or flogger (safer, I think) has to be extremely perceptive and capable of not getting lost in his own gratification from administering pain.