Riddle for you to think about.?

Arnold Schwarzenegger has a big one.
Michael J. Fox has a small one.
Madonna doesn’t have one.
The Pope has one but doesn’t use it.
Clinton uses his all the time.
Bush is one
Mickey Mouse has an unusual one.
Liberace never used his on women.
Jerry Seinfeld is very, very proud of his.
Cher claims that she took on 3.
We never saw Lucy use Desi’s.
What is it?

Dont cheat and look at other peoples answers.
I didnt want to post the answer here because you would see it. But if you want the answer, follow this link. The page has nothing to do with this question, but the answer is printed here.
The answer is on this page in quotes where it reads:
CD: Charlie, “ANSWER IS HERE” Wilson