Why are douchebags and jerks so successful with women?

I know a lot of women say that is not true at all, but every time I go downtown or in college, I always see the "jerks" with the most beautiful women, or rarely alone at least. On the other hand the guys that would probably make good husbands and boyfriends are always left to the side, even if they as well, show interest.
Why are douchebags and jerks so successful with women?
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