Let's be honest - it is not difficult for women to get sexual thrills, if you are feeling frisky it is as easy as swipping right on Tinder or going out. Married men are often not in top-shape and it'd be hard to reason they offer security. If you want to be cynical - financially, there can't be much gain either (existing commitments.) What is the attraction? I have to say I never really understood what is in it for the ladies.