In the mess the officers are discussing the question whether sexual intercourse involves more work or more fun.
The old staff officers vote unanimously for 80% hard work and 20% fun.
The captains are for 50% work and 50% fun.
The young lieutenats are for 20% work and 80% fun.

So they decide to ask an orderly. The orderly says: "No work, all 100% fun."
Asked why? he answers: "If there was a little bit of work in it, we enlisted men would have to do it.

And nr 111 again.