Answer This Riddle?

Riddle For The Day:

Arnold Schwarzenetter 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,

Bill Clinton uses his all the time,

Bush is one,

Mickey Mouse has an unusual one,

Liberace never use used his on women,

Jerry Seinfeld is very, very proud of his,

Cher claims that she took on three,

We never saw Luci use Desi’s.

What is it…?