Sex education

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."