An epidemic in America is that more and more births are to single mothers. Deadbeat fathers move from partner to partner and don't bother taking responsibility for sticking their members into a woman for a few seconds of pleasure but don't want to man up and take care of the next 20 years of consequences. Of course men cheat on women more because they don't want to deal with being a father.
Whatever happened to it takes two to tango? There's nothing that indicates women have more affairs than men, affairs are something that spawn out of mental weakness, not gender. Women are certainly shunned more when they do have affairs, but that doesn't mean that they have them more frequently than men.