Rubbing for a wish

A few months after his parents were divorced, Little Johnny passed by his mom's bedroom and saw her rubbing her body and moaning, "I need a man, I need a man!" Over the next couple of months, he saw her doing this several times. One day, he came home from school and heard her moaning. When he peeked into her bedroom, he saw a man on top of her. Little Johnny ran into his room, took off his clothes, threw himself on his bed, started stroking himself, and moaning, "Ohh, I need a bike! I need a bike!"