Two of them

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