That's not usually why women cheat. Women will usually cheat because they are lacking something in their current situations. Usually it's when they feel alienated that they'll go out and seek that attention or desire for attraction elsewhere. It's so seldom an "I'm horny so I'm gonna screw someone else" thing (unless they really are a whore) It's almost always because they were not getting what they needed at home, so to speak.
I'm not sure if usually is the correct term here. I know so many of my female friends who cheat around and in my conversation with them, this is what I've found.
I think one of the reason is either the guy doesn't give her enough attention. Another cause is if the guy is too good to her and she just needs to find some guy who just want to b*ng the sh*t out of her and treat her like a piece of meat. For many women, being treated like such is either a turn on of sorts or alleviates them of whatever guilt/stress they have about many aspects of their lives. Cheating is for many women empowering.
My housemate in College was this beautiful half korea half spanish girl who grew up in Canada. Her boyfriend is this average looking white boy who you'd find playing on some high school football team in Arkansas. He did pretty much everything a good boyfriend in a hallmark movie would do, but she cheated on him on a weekly basis, probably because she feels like sex is the only way she can control men. How she came to that disposition is beyond me.
Anyways, its not right to label them as whores or sluts. That's over simplifying a complicated person with a particular psychological disposition. There are a complicated chain of causes which led them to being so, like childhood abuse, incest, rape, emotional trauma in high school. In most cases, they have borderline personality disorder and probably needs therapy. What they need is your sympathy not disgust.
That said, if you know what's good for you, you should never get involved with women like that.