 All reproductive activity occurs through the cloaca, the single exit/entrance at the base of the tail where waste is also eliminated.Most reptiles have copulatory organs, which are usually retracted or inverted and stored inside the body.In turtles and crocodilians, the male has a single median penis, while squamates, including snakes and lizards, possess a pair of hemipenes, only one of which is typically used in each session.