Nothing. I'm a solid 9 in the intelligence and personality department. Looks, well, I'm not young, I'm probably an 8 now, maybe a 7. My current husband was an 11 back in the day, but 30 years changes people and to me he's still and 11 and was when we reunited 8 years ago. Others would give him a 6. So what.
Yes, we have to be attracted to the person, but there's a whole lot that goes into attraction, including character, intelligence, humour, etc.
I used to chase the hot guys. I never got them. And I'm so glad I didn't. I think as we mature as people, we look for more substance over packaging. Or at least I hope we do.