Though we don't usually encourage mixing sex with excessive drinking, there's no denying that it happens, especially on New Year's Eve. Our best advice is to plan ahead, choose your date, and be prepared with condoms and whatever else you need before the booze starts flowing and the big ball drops. If that fails and you do end up "accidentally" having sex while blitzed out of your senses, print up this handy flow chart to sort things out when you come to the next day. And no, drunken New Year's masturbation doesn't count.