A Lieutenant, a Major, and a Colonel were dining with the General in his
quarters one evening.  The conversation turned to sex and the Lieutenant
stated that making love to your wife is 10% work and 90% fun.
The Major disagreed and stated that he believed making love to your
wife is 40% work and 60% fun.
The Colonel then stated that they were both wrong and that the ratio is
80% work and 20% fun.
They decided to put the matter to a young Sergeant.
"Well, Sir," he began, "I think you are all dead wrong.  It must be
100% fun."
 "Why do you say that?", asked the General. 
"Because," answered the young sergeant, "if it involved any work at
all, you'd assign an enlisted person to do it for you."