From memory, although I can't remember where I picked it up. Possibly the book of rugby songs:

Now you're growing old and feeble and your pilot light is out.
What used to be your sex appeal is now your water spout.
You used to be embarrassed just to make the thing behave,
For each and every morning it would stand to watch you shave.
But now you're old and feeble, and it sure gives you the blues
To see the thing hang down your leg, and watch you shine your shoes.