Ah, I heard about this in Missy's interview (well, one of her interviews). Anyhows, the basis of the game is to take a shot everytime Lex touches his wang. Apparently he just can't help himself ... and gives his friend a tug now and then during his matches.
First of all, not in my SI. I couldn't find this story anywhere in my latest issue of SI (with Kenyon Martin on the cover). If someone could tell me what page it's supposed to be on, that would be a great help in figuring out what the hell is up here.