S and M is only the expression in the bedroom of an oppressive-submissive relation which can happen also in the kitchen or at the factory, can happen between people of any gender. There is obviously something titillating about these relationships, but it isn't the sexual components that makes them ugly, they're uglier elsewhere. Nothing sexual is depraved. Only cruelty is depraved, and that's another matter.
Marilyn French, The Women's Room
bdsm