Why do condoms come in 3,6,12?



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Why do Condoms come in boxes of 3, 6 & 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 matter-of-factly replies, "Those are called condoms son.
> Men use them to have safe s_x." "Oh I see," replied the boy pensively.
> 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
> 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
> 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
> married men. One for January, one for February, one for March, etc.......