A boy comes home from school and hears strange moans coming from his mothers
bedroom.  He goes to her room and finds her masturbating - moaning "I need a
man, ohhh, I need a man".

The next day, it happens again.  He goes to her bedroom door and she's 
maturbating, crying out "I need a man.  I need a man!"

This happens several more times, then one day the boy comes home to find his
mother in bed with a man.  He runs to his room and starts masturbating, 
crying out "I need a bike.  I need a bike."