A little Native American boy asks the chief how babies in their tribe get their names.
The chief replies, "When a baby is born, his father takes him outside the teepee, holds him over his head, and names him after the first thing he sees - like 'Running-Wolf' or 'Flying-Cloud'. Why do you ask, Two-Dogs-Screwing?"
Little Johnny's parents got divorced. One night Little Johnny walked past his mother's bedroom, the door was open, and he sees his mother lying on her back playing with herself, saying "I need a man... I need a man..."
A few nights later he walks past her bedroom again, the door's open, and he sees his mother with a man on top of her.
Little Johnny runs to his room, jumps on his bed, pulls down his pants and starts playing with himself, saying, "I need a bike... I need a bike... "