The point isn't that we should aspire to some Arcadia of perfect chastity. Rather, it's that a high sexual ideal can shape how quickly and casually people pair off, even when they aren't living up to its exacting demands. The ultimate goal is a sexual culture that makes it easier for young people to achieve romantic happiness -- by encouraging them to wait a little longer, choose more carefully and judge their sex lives against a strong moral standard.
This is what's at stake, for instance, in debates over abstinence-based sex education. Successful abstinence-based programs (yes, they do exist) don't necessarily make their teenage participants more likely to save themselves for marriage. But they make them more likely to save themselves for somebody, which in turn increases the odds that their adult sexual lives will be a source of joy rather than sorrow.
Why Monogamy Matters
I was surprised to come across this article in the New York Times a few days ago. An excerpt: