They've kissed and cuddled, and their "Dungeons & Dragon"s characters had sex. But could Sheldon (Jim Parsons) and Amy (Mayim Bialik) finally do the deed -- or perhaps even utter the L-word -- in The "Big Bang Theory's" Valentine's Day episode, airing Feb. 6? "It is a very big, very sweet episode for Amy and Sheldon," Bialik teases.
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