But since that’s the case, why the hell is cheating, something that hurts somebody so much, so common? According to research, almost 60 percent of men and over 45 percent of women will cheat at some point in their marriages. That’s a. Oct 18, 2014. In 2001, Noel Biderman launched what is now one of the biggest online-dating sites in the world for people seeking affairs—AshleyMadison.com. Named for the two…