A Boy and his dad are at a chemist. They walk past the condom display and the boy asks, "Dad what are those for?" The dad replies, "Son they're for safe sex."
The little boy then asks why one box has only 3 condoms. The dad answers, "Because that is for high school boys. One for Friday night, one for Saturday night, and one for Sunday night."
The boy then inquires why another box has 6 condoms. The dad explains that it is for college boys. 2 for Friday night, 2 for Saturday night, and 2 for Sunday night.
The boy sees another box of condoms with 12 and asks his dad why. The dad says, "Son that is for married men. One for January, one for February.... "