Ross Douthat's latest column in the New York Times:

...there are different kinds of premarital sex. There’s sex that’s actually pre-marital, in the sense that it involves monogamous couples on a path that might lead to matrimony one day. Then there’s sex that’s casual and promiscuous, or just premature and ill considered.

This distinction is crucial to understanding what’s changed in American life since the sexual revolution. Yes, in 1950 as in 2011, most people didn’t go virgins to their marriage beds. But earlier generations of Americans waited longer to have sex, took fewer sexual partners across their lifetimes, and were more likely to see sleeping together as a way station on the road to wedlock.

And they may have been happier for it. That’s the conclusion suggested by two sociologists, Mark Regnerus and Jeremy Uecker, in their recent book, “Premarital Sex in America.” Their research, which looks at sexual behavior among contemporary young adults, finds a significant correlation between sexual restraint and emotional well-being, between monogamy and happiness — and between promiscuity and depression.