It's Good Old Monogamy That's Really Sexy

Somewhere, when I was young, I got the idea that the average American couple had sex twice a week, and I've carried this figure in my head for more than 30 years, as a benchmark, like the .300 batting average or the idea of three square meals a day. There have been times when any sex at all was a beautiful faraway ideal, like reincarnation, and there have been other periods when twice a day or hourly seemed pretty normal. But twice weekly was the norm, I thought, so it's a surprise to learn that according to the new survey, once...