A father and his son go into the grocery store when they happen upon the condom aisle. The son asks his father why there are so many different boxes of condoms.

The father replies, Well, you see that 3 pack? Thats for when youre in high school. You have 2 for Friday night and 1 for Saturday night.

The son then asks his father, Well whats the 6 pack for? The father replies, Well, thats for when youre in college. You have 2 for Friday night, 2 for Saturday night, and 2 for Sunday morning.

Then the son asks his father what the 12 pack is for. The father replies, Well, thats for when youre married… You have one for January, one for February, one for March…