Interesting, Ormus, quite interesting thread.
Talking for myself only, I believe that brains are not sexy alone. It need a correct body. You know, there is a minimum that you find cute. If the girl is over that minimum, physical isn't a matter from now on. After that, it surely is the personality. I believe that being open minded probably is the best quality, because it includes a lot of others. Actually, it's a whole. I can't really describe. For me, it's more about basic value and a personality developped around it. She has to be honest, with me and herself. I'm not supposed to be her God, neither a nobody. Equilibrium surely is the key. Sense of humor, respect, humanity, honesty. These are basis. After that, it's "her qualities CONNECT with you and her bad sides convey you". I'm not sure of the term "convey", cause I'm not sure of it's meaning... It's that you can "tolerate" her bad sides, because they aren't THAT bad. Get what I mean.
Also, someone said that there are different intelligence. I agree. As long as the person "really" uses its brain, it's alright. It's hard to put in words. Hope you understood...