I always find intelligent women more attractive.
More attractive. Act or not, the airhead thing has never done anything for me (nor has the damsel in distress, for that matter), whereas strong, intelligent females, such as Amy in the West Wing, for example, drive me wild.
Intimidating? No. I find it attractive in a more committed relationship. When it comes to sex, I still want someone that I enjoy talking to long enough to bed, even if my standards aren't so important as with actual dating. this is why I no longer pursue college girls for casual sex, even though I have had two over the last year into me. I couldn't find a single thing to talk to them about besides drinking and sex. Even for sex, the conversation can't be COMPLETELY meaningless.