A father and his young son are in a chemist's one day, when the little boy notices the contraceptives rack. "What are those for, dad?" enquires the youngster, pointing at a pack of three condoms. "Well son" says the father "they're for for single fellas that go out chasing women on the weekend. There's one for Friday night, one for Saturday night, and if he's lucky, one for sunday night too". "What about these?" asks the young lad, pointing to a six-pack of condoms. "They're for guys who have steady girlfreinds" answers his father "One for Monday, one for Tuesday, one for Wednesday, one for Thursday, one for Friday, one for Saturday, and on sunday they have a day off" "OK dad" says the little boy "What about this 12 pack?". "They're for married couples" replies the father "One for January, one for February, one for March......"