Turn on: A beautiful face.
Turn off: huge bewbs. I mean, shapely smaller boobs are nice. I hate those floppy huge ones that look like they'd get in the way. lots of colorfull tattoos. a small trampstamp isn't going to get me chucking bricks to get them to leave me alone, but give me a girl with some big artistic picture on their arm and I've got a brick shaped slingshot for the occasion.