I've done this twice and it worked once and didnt work once I'm in college so there is a lot of random drinking and partying on the weekends. Twice i've found myself with a girl that i've been talking to for a while and we've been flirting and we're alone, I felt like a gambler and tried this question, "If I have the biggest dick you've ever seen, then i get head. If it's not I'll buy the rest of your drinks for the night." obviously not that blatantly. but once I won and once I lost, so batting .500 isn't bad? Anyone else ever make any games like this?