After spending six months in a desert outpost, the new recruit goes to see his commanding officer.
“I’m sorry, Sir, but this place is driving me nuts. If only we had some female company.”
“Well, I can’t do anything about that, son,” replies the officer,
“but we do have something else. There’s a barrel over there with a hole in the side and you’ll find that will help to relieve your frustrations. You’re free to use it any day but Wednesday.”
“Thank you, Sir,” replies the recruit, “but why can’t I use it on Wednesday?”
“Well, it’s all based on a sharing system and on Wednesdays it’s your turn in the barrel.”