........ masochistic sex isn't usually considered harmful, Straus said. Though there aren't adverse effects, Straus said he doesn't condone it.
"For me, gentle, loving sex is the thing," he said. "I think the world would be better if there were more people who liked gentle, loving sex than (people who) linked even play-violence to sex."
This guy is an idiot. Child abuse is VERY wrong, but sex between consenting adults is different. Look at his picture, below. Would YOU listen to this man's advice on your bedroom behavior?

Regular sex is fine, but if a sex partner wanted me to spank her because it makes her hot to trot, you can be damn sure I'd do it.

P.S. MURRAY: In case you don't know, most people do NOT incorporate S&M stuff into their sex lives. What fucking planet do you come from?

Below: The author, Murray Straus, who wants everybody to be as lame as he is. Probably wears women's underwear and a skirt at home.