A man went to the doctor's. The doctor came in and said,
"Well, I've got some good news and some bad news. The bad
news is that you have an inoperable brain tumor. The good
news is our hospital has just been certified to do brain
transplants and there has been an accident right out front
and a young couple was killed and you can have whichever
brain you'd like. The man's brain costs $100,000.00 and the
woman's brain costs "30,000.00." 

The patient could not help but ask, "Why such a large
difference between the male and the female brain?" 

The doctor replied, "The female brain is used."