A man walks into a drug store with his 8-year-old son. They happen to walk by the condom display, and the boy asks, "What are these, Dad?"

The man matter-of-factly replies, "Those are called condoms, son. Men use them to have safe sex."

"Oh I see," replied the boys pensively¹. "Yes, I've heard of that in health class at school."

He looks over the display and picks up a package of three and asks, "Why are there three in this package."

The dad replies, "Those are for high-school boys. One for Friday, one for Saturday, and one for Sunday."

"Cool!" says the boy. He notices a pack of six and asks "Then who are these for?"

"Those are for college men," the dad answers, "Two for Friday, two for Saturday, and two for Sunday."

"WOW!" exclaimed² the boy. "Then who uses these?" he asks, picking up a 12-pack.

With a sigh, the dad replied, "Those are for married men. One for January, one for February, one for March."