Riddle

• Schwartzenegger has a big one
• Michael J. Fox has a small one
• Madonna doesn't have one
• The Pope has one but doesn't use his
• Clinton uses his all the time
• Mickey Mouse has an unusual one
• George Burns' was hot
• Liberace never used his on women
• Jerry Seinfeld is very, very proud of his
• We never saw Lucy use Desi's

What is it?

Answer below!

The answer is: "A Last Name."

And you thought this was a dirty joke!