A fifth grade teacher is told she must teach sex education to her class. She decides to use a math technique to teach the subject, and thinks flash cards will work well.

The next day in class, she holds up the first flash card, a picture of a breast, and asked does anyone know what this is? Little Suzie responds I know, I know! It's a picture of a breast and my mommy has two of them! The teacher says very good Suzie, you get a star for the exercise

The teacher grabs the next card and holds it up. It's a picture of a penis. She asks Does anyone know what this is? and little Tommy says I know I know!! It a penis and my daddy has two of them!!!

The teacher says well Tommy, It is a penis but your daddy can't have two of them.

Tommy says sure he does, he's got a little one he pees out of and a great big one he brushes mommy's teeth with!