Trojans

A father and son were in a drugstore waiting for a prescription, when the little boy noticed a box of Trojans. The little boy asked his father why do condoms come in a box of two,

Father replied; well that's for your teen years son, one for Friday night and one for Saturday night.

Then the boy pointed to a box that had 6, father replied, well that's for your college days son, 2 Friday night, 2 Saturday night, and 2 Sunday night.

The boy said well dad this box has 12, father said well that's for when you get married son, one for January, February, March, April, May, June, July, August, September, October, November, and December.