Dilemma of attractiveness

There’s a lot of bad jokes about blondes being stupid. And sometimes I wonder if there could be some substance to it. But in a more general sense: is there any reverse correlation between intelligence and outward attractiveness? Or more precisely, between intelligence and ones subjective impression about ones own outward attractiveness? (Also note that correlation means just, some statistically significant interdependence, while there can be lots of exceptions, like pretty and  intelligent folks.)

There are some reasons that stand aside to explain such a correlation, should it exist:

• The non-attractive people are those who have other interests than being attractive. Yes, I do think that everybody is “potentially attractive”, just some people do not take the time to reveal it by developing and maintaining a personal style. That is totally ok, people have different interests after all. Those folks might instead deal with a topic in depth, and thus reveal their potential technological / emotional / social or whatever intelligence to a fuller extend. They might also deal with other stuff, like success in entrepeneurship, but we’re after a correlation with intelligence only here. Note that intelligence is commonly thought to depend both on genetic disposition and education, which means much can be done by education independently of ones genetic disposition.
• Likewise, those interested in making themselves attractive by styling might find that they lack the time to really pursue interests in other topics  like science, technology, society, arts, medicine or whatever.
• People who are naturally attractive because of their genes (meaning, also if they don’t care about styling) will often find that they do not need to be anything else except attractive. Especially women can get all the advantages in life by being attractive – ok and sociable, but they need not be intelligent and learned in math, science, technology, music, art or whatever demanding discipline there might be. So why should they bother mastering these difficult matters?
• Likewise, the not naturally attractive people might feel that they need some other content in life to feel worthy and some content to get accepted and maybe praised by others. So they might develop interests in other special areas, like science and technology.

As always, this is experimental thinking. And where I did include observations, I do not endorse them as to be right, legitimate or morally good.