Or as my college roomie used to say, 'God will throw a sexy woman in your path every six months.' So don't fan any coals that come your way. One member of a relationship has to switch strategies. "People abandon their long-term sex strategy in favor of a short-term strategy because of lust," Williams says. I think the most dangerous thing is to fall in love." The least dangerous kind of an affair, he says, is the kind of one-night stands that happen at a convention or a conference where people part and never meet again.
The theory that men's and women's sexual desires are hard-wired isn't new. Now a central tenet of evolutionary psychology, the theory holds that our sexual behavior evolved over millennia and is encoded in our brains. If that's true, men's sexual desires should be the same for men everywhere.
"If you honor fidelity as important to you and your relationship, it is a matter of your own integrity to honor that.
"And, as the Catholics say, there is the issue of avoiding proximate occasions of sin. When people tell me they are having an affair, they think the most dangerous part is getting caught.
"What we found is that when men opt for short-term mating, they pursue larger numbers of partners than women," Schmitt says.
"When women go short-term mating, they don't go for large numbers. They look for physically attractive men who have masculine facial features.