A father is in the drugstore with his young son when the boy discovers the condom aisle. "What are these, Dad?"

"Well, son, those are condoms. They're for protection when you're having sex."

The son points to a pack and asks, "Why does it have only three in it, Dad?"

"Well, son, those are for high school boys: one for Friday, one for Saturday, and one for Sunday."

"Well, why does this pack have six in it?"

"Well, son, those are for college men: two for Friday, two for Saturday, and two for Sunday."

"Well then, what about this package with 12 in it?"

"Well, son, those are for married men: one for January, one for February..."