In fact sometimes I'm completely turned off by really good looking guys if they look like they know it, a bizarre sort of mistrust I suppose.
Not at all bizarre, Shinju Chan!! Ever heard of the 'halo effect'?
It's where we attribute or assume attractive people have positive personality traits just because they are good looking, and as a consequence, very good looking people can often get away with very unattractive behaviour, and they also don't have to work as hard at developing "nice" personalities. And yes, this is a generalisation, but hey, I studied it in Psychology at University, so don't blame me for the theory.
I've often wondered too if the opposite happens - where people who are very unattractive develop personalities in response to other people's 'rejection' of them.
Shinju Chan, one of THE MOST drop-dead devinely gorgeous-looking men I ever met, (over 30 years ago and I can still remember his face!) , turned out to be one of the most ugly people I've ever known - totally selfish, inconsiderate, unfeeling, manipulative, self-centered....plus plus plus. He didn't have to be decent and nice, especially to women, as his looks reeled them in like placid fish!