Julianne Moore explains to David Letterman that she had a sex talk with her son already and told him that he could ask her any question that he might have about any word.  When he said, "Really Mommy, any word?" She thought, "Don't let it be fellatio." So Letterman asks, "Well, what does that mean?" With a quick comeback, she said, "Ask your mother!"

Hilarious!

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