Usual ways you can tell if its a boy or a girl is by the size of the pre-anal pores, the size/general shape of the bulges at the cloaca i.e. one (or no) bump thingo or two, and there is a slight difference in head shape/size, oh and thickness of the base of the tail etc... I think they are the main differentiating factors... May have missed one or two... But yeh, most people go off the bulges...