Physical - BAD HYGIENE! Basically just girls that don't take care of themselves in general. Work out, eat right and stay well groomed and you will go a hell of a distance.
Attitude - Being lazy, grumpy, naggy. I know this should go without saying but as funny as it might be to you and your girlfriends talking about farting and pooing is not funny to us. At all. Bitching about other girls isn't attractive, I know it's hard not to:P, talking about other guys is a turn off. All the usual stuff really, there is nothing suprising to ye what turn's us off, if in doubt just don't do it:P