Why Condoms come in boxes of 3, 6 and 12...

> 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?
> To which the man replies, "Those are called condoms, son. Men use them to
> have safe sex."
> "Oh I see," replied the boy. Yes, I've heard of that in health class at
> school." He looks over the display and picks up a package of 3 and asks,
> "Why are there 3 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 6 pack 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!" exclaimed the boy, "then who uses THESE?" he asks, picking up a 12
> pack.
> With a sigh and a tear in his eye, the dad replied, "Those are for married
> men. ONE for January, ONE for February, ONE for March...........