This happens because women get bored and left to their own devices with enough frequency and presented with EASY OPTIONS like the internet/smartphones/dating apps have done and this becomes a perfect recipe for disaster.I get what you guys are saying about women being more likely to cheat emotionally or with the prospect to get to a new guy. But this doesnt explain women cheating when they are on vacation or f*cking their fitness instructor or someone on a girls night out. Women also do this for pleasure. And believe me, they also often do this kind of cheating...
This happens to women that are bored in their relationships(boring sex) or felt like they have been wronged in any way by their guy, or are going through a type of mid-life crisis.
I've been on the other end many times unfortunately of having these women cheat on their husbands or bf's with me. Girl's night out, Girl's vacations, Business trips are a pretty common opportunity for girls to cheat.