Does something about me say "If you're creepy and in need of a date please come hit on me"? Alright, so you find a girl attractive. Congratulations! But after the age of, oh say 12, there are acceptable ways of expressing your interest in others. Scribbling "You're HOT" next to a little drawing of a devil and your phone number on a receipt before returning it to the table you're waiting on doesn't really ring a bell. Does that actually work for anyone not attending grammar school? In my mind its roughly the equivalent of the phone number graffiti in the truck stop bathrooms. Excuse me while I vomit. (Good thing there are toilets handy).
A gentle suggestion to the young men out there, if you like a girl, talk to her. Be up front. Or if you're waiting on her or interacting with her in some other professional setting, perhaps just admire her from afar. It may not be the most appropriate time for you to express your interest. Either way, just use your head and your manners and not so much a pen and the nearest scrap of paper.