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Joan Rivers

Johnny Carson's Penis ...

I TOUCHED IT

3/12/2014 11:40 AM PDT BY TMZ STAFF



Unlike the rest of the universe, Joan Rivers isn't all that curious about seeing how big Johnny Carson's penis really is in that sex tape -- because she says ... she's already seen it up close and personal.

Joan -- who guest hosted on Carson's "Tonight Show" for years -- said she and Carson had a "one night bounce" back in the day ... and he was hung like a horse.

Still, Joan says she REALLY wants to see the sex tape for another reason -- check the clip.

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