Sex Education

One day in class the teacher has sex education.On the black board she draws a penis then asks the class if any of them knows what it is.
In the back of the room,Dirty Johnny stands and says "That's a penis,and my father has two of them". 
The teacher looks surprised and asks "What do you mean,two?"
Dirty Johnny responds,"A little one to pee,and a big one to brush the baby sitters teeth."

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