Here you go, ladies, definitive proof that you're doing it wrong - men appreciate direct pick-up lines, because you're always sending fuzzy 'positive' feedback, making it difficult for a guy to tell the difference between polite friendliness and actual interest. We're not freakin' mind readers! Note that crude humor ranks low to everybody; your pick-up line about a blowjob in the bathroom might make your friends laugh, but, er, it doesn't satisfy anybody's dreams of relationships.