Abstract: A medical device comprises a model of a male child with a urination-simulating mechanism including a removable reservoir disposed interiorly of the model for holding a liquid and a pumping mechanism for expelling the liquid from the reservoir into a passage upon actuation of the pumping mechanism. A penis member on the model has an opening simulating the urethral opening in a human penis, and the passage is in communication with the opening. The arms of the model are movable and Velcro.RTM. fastening material on the penis member and on the hands of the model attach the hands to the penis member in a manner that illustrates how an adult male grasps his penis during urination. The model is placed in front of a toilet with the opening in the penis member pointed toward the toilet bowl and with the hands attached to the penis member, and the adult performing the demonstration actuates the pumping mechanism to expel liquid from the opening and simulate urination.