So lets assume we all have to pick one thing that really turns us off (physically) about the opposite sex. What is it that turns you off a man/woman...so much so that even if the rest of him/her was great...this one thing would be enough to ruin it?
For me its feet. I went to university and one of my flatmates was a beautiful woman from Essex but one day she took her shoes off and her toes and feet were just....ugly. Not like dirty. Just reallly disproportionate and ugly. It was an immediate turn off. Even now when I see her I think she is beautiful but I just know the feet would be an issue if she were my long term lady friend.
So OT what is it for you...what physical feature kills the buzz stone dead?