A 2nd grade teacher decides to teach sex ed. to he

A 2nd grade teacher decides to teach sex ed. to her class. She starts out by drawing a penis on the chalkboard and asks the class, "Does anyone know what this is?"
Little Johnny says, "Yes, my dad has 2 of them!"
The teacher says, "Are you sure about that?"
Little Johnny says, "Yes, he uses a small skinny one to go to the bathroom, and a big long one to brush the baby-sitters teeth."