I had a boyfriend who said his previous girlfriend was a knockout. He also said she felt that she was so beautiful that she deserved to be taken care of. I don't know how common that is, but if it is, that sure would scare guys off unless they're made of money.

My other thought is that I think the expectations are higher if you are beautiful. ie: Perfect on the outside...therefore must be perfect on the inside. If you disappoint in that respect then I think it's a huge letdown for them. Better to tone it down a bit. Underpromise and overdeliver kind of thing.