It might be argued that a woman who sleeps around quite a bit is more likely to have certain undesirable personality traits in a man's experience as well. Anecdotal as it may be, the most promiscuous women I have known tended to have other character traits in common. Chiefly among these were unreliability, immaturity, and serious insecurity. Also, study after study has shown that women have the most satisfying sex in committed relationships with the same partner over a long period of time. Simple horniness doesn't really explain sleeping around a whole lot.
If I may be so bold as to suggest simple biology - men are apt to sleep around as we naturally desire to proliferate our genetics as far and wide as possible. It is in a woman's best interest to have a stable provider for her offspring, hence their natural preferance for relationships. Of course it's all much more complciated than that once you get into it, but the underlying structure is fairly concrete. Frankly I am not particularly impressed when I meet a woman that's really been around, political correctness and sensitivity be damned.
Just as it is their preferance to sleep with lots of men outside of committed relationships, it's my preferance to not want to have anything to do with them. There is also something to be said for the fact that women acting in this manner are somewhat frowned upon by society at large, and yet they still do so. To me it often is a sign of attention seeking or a person that somebody else described as 'in love with being in love.' The unquenchable desire for male adoration and frequent, shrill emotional episodes are both qualities that send me running, and you can bet that many a promiscuous woman manifests them in varying, but nonetheless annoying degrees. I'm really no moral prude, but in this day and age if I understand that an adult woman sleeps around a good deal, I don't hesitate that she's probably dealing with some issues I'd really rather have nothing to do with her. So far this hasn't been a problem, as the most attractive and intelligent women I've encountered tend to agree with me on the issue, at least so much as is reflected by their conduct. It's generally the 'looser' crowd that I find can't hold much of a conversation and don't take care of themselves.