Answer:
Kid's words- wee-wee; weenie; pee-pee; weiner; ding dong; mini twinkie, winky
"polite" words- thing; male member; male organ
usually o.k. words- johnson; john thomas; wilson; willy; stick; schlong
a bit "advanced"- dick; wang; dong; choad; pecker; prick; hog
not for mixed company- cock; pud; urinary path; package; baby maker
creativity: one-eyed trouser snake, tally-whacker, heat-seeking love missile, beef bayonet, wedding tackle, pork sword, little soldier, baloney poney, my little pony, my other head, power drill, magic wand, joystick, jack hammer, frankfurter, Captain Winkie, summer sausage, jack-in-the-box, bread in the basket, long john silver,GodZilla, Super secret agent hosepipe.