Joke of the week 1

A boy goes to the local drug store with his dad and sees many different sized boxes of condoms.

Boy: "Dad, why do they sell condoms individually?"
Dad: "Those are for the high-schoolers for Friday nights."
Boy: "So, why do they make packs of three?"
Dad: "For the college guys for Friday, Saturday and Sunday nights."
Boy: "Then why do they make packs of 12?"
Dad: "Those are for married couples - you know for January, February, March..."