Fifteen-year-old Aki Simon has a theory.And its mostly about sex.No, it isnt that kind of theory. Aki already knows shes bisexual--even if, until now, its mostly been in the hypothetical sense.Akis theory is that shes only got one shot at living an interesting life--and that means shes got to stop sitting around and thinking so much. Its time for her to actually do something. Or at least try.