A group of bored military officers start talking about whether sex is work or fun

The lieutenant goes first and says, "I feel that making love is 80% fun and 20% work."

Then captain responded by saying, "No, I think that making love is more work than that. I would say that it is 60% fun and 40% work."

Finally, the major says, "No, making love is definitely way more work than that. I would say that it is 20% fun and 80% work."

They are all contemplating these revelations when a private walks by. The officers call the private over to ask his opinion.

The major says, "Excuse me, private, we are having a discussion and would like your input. The lieutenant says that making love is 80% fun and 20% work. The captain says that making love is 60% fun and 40% work. I say that making love is 20% fun and 80% work. Private, what is your opinion?"

The private says, "Well sir, you are all wrong. Making love must be 100% fun, because if there was any work involved, you would have me do it.