That and being a gentleman... Girls notice guys more who like pull out their chair for them and hold the door for them... No one does it anymore, so when a guy does do it, it makes her look back at him.
Just a tip for you guys out there ;D
A guy used to pull out my chair and hold the door for me and escort me sometimes, and even though he wasn't that hottest guy ever, he was pretty damn charming. So he managed to score a date.