Ewan McGregor on the thrill of falling in love with Jim Carrey

Ewan McGregor's naughty bits have been onscreen almost as often -- if not more -- than Harvey Keitel's. 

His backside debuted in" What the Butler Saw" and his frontside has been seen in "Trainspotting," "The Pillow Book," and  "Velvet Goldmine." Not that we're keeping count or anything.

But those films are tame to his upcoming movie, "I Love You Phillip Morris," costarring Jim Carrey.