A boy goes to the drug store with his dad and sees the condom display.
Boy: 'Dad, why do they do packs of one condom?'
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, January, February, March.'
Next Joke: Three third graders were walking down the street