Solve this riddle…first person to get this right gets 10 points?

Schwarzenegger has a big one,Michael J.Fox has a small one.Modonna doesn’t have one.The POPE has one but doesn’t use it.Clinton uses his all the time.Mickey Mouse has an unusual one.George Burn’s 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??

First person to get the right answer gets the ten points.