The turn on for me has always been a man's SMILE; an open, genuine, easy smile. And then (physically) I notice his hands. I prefer groomed nails and a few callouses. A little fleck of greese on a nail or two in casual circumstances (ie. not on a date) has me thinking this guy might even be able to change oil and oil filter on a car....hmmmm... might be right handy to have around long term.
All humor aside, the SMILE is #1....