For a woman, for me, it would have to be the way they dress. Call me whatever, its just, if a girl walks around in a tracksuite with earings bigger than your fist, I tend to stear clear. If they are dressed in shiny black coats with pitch black hair and spikey metal boots, I'll stear clear. Other than that, also, if they smoke, I wont even look. I had a GF once that smoked and I wont make that mistake again.