I've seen statistics that show women cheat a lot more than men do in their 20's and 30's, and then men take the lead in their 40's+. For men I'd assume that's because women stop wanting sex with their partner at that age and men get desperate. Still, women cheat by a lot more when they're younger. I know most of the women in my friend groups have cheated at least once. I have a lot of travel plans in the next couple of years, and I'm afraid if I have a girlfriend during that time, I'll get cheated on if I'm gone for more than a few days.