Obviously women want men that are good to them.  But they also want high quality mates (which tend to be jerks, because they can afford to be, the same way they prettiest women tend to be bitches, because they can afford to be).  They're also more likely to dump a guy that's way too nice because he seems desperate, which means she could probably do better.<p>So the end result is that a woman might date the high quality male even though he's a jerk and dump the nice guy, simply because she's looking for quality.