To make a mold of thier own penis? I see them at all the adult stores, and my friends joke about them all the time. The joke being, never make a mold of your penis because your gf will take the mold and have no more use for you. But all joking aside, has anyone ever used one? If you have, what for? -just for yourself -to give as a gift -to give the kit as a gift to someone -or any other reason?