Zuska links to this article by Natalie about teenage girls being presented with stupid role models. The following quote is representative:
Unfortunately, the message repeatedly rammed down our throats, even today, is that women are not attractive if they are smart.
This is certainly the case. I just wanted to emphasize two points. Teenage boys are also influenced by this pop-culture message, which can make them search out and prefer the stupid, sexy, submissive girls they see advertised. (Read: encourage such behavior in girls who wouldn't behave that way by themselves.) And there is also another message, which says men are not successful and attractive unless they are physically strong, aggressive and uncompromising. And incidentally stupid.