Evolution made me do it. Many articles here is one , and here is another , especially in recent years, have explored the theory that men sleep around because evolution has programmed them to seek fertile and, conveniently, younger wombs. But what about women? If it's really true that evolution can cause a man to risk his marriage, what effect does that have on women's sexuality? A new journal article suggests that evolutionary forces also push women to be more sexual, although in unexpected ways.