I'll play devil's advocate here and say I've definitely noticed an inverse relationship between looks and intelligence. Is that a real difference or a perceived difference? Is it stronger in women than men? That I can't tell you. But I do think there's some credence to the idea that , the more attractive you are, the less value you might see in studying and the more value you'll see in socializing and partying. From the woman's perspective especially I can see the potential allure of forgoing education entirely to subsist off of a man instead and if you've got very good looks you've got an easier time of it and your choice of the bunch. Does that make the woman stupid? Quite the contrary, I think it's a smart move all things considering. But I do think it means you'll have that inverse relationship between looks as "intelligence" or rather book smarts. I don't think it's much different than the stereotype of the highschool jock football player being dumb as rocks.

Course I think some of it is just that the very attractive and smart women are already spoken for and as such don't put so much effort into attracting the attention of men because they don't need it.