[Spoiler alert: The following article contains spoilers for upcoming episodes of "The Big Bang Theory."]
"The Big Bang Theory" is boldly going where no Sheldon has gone before!
After five long years of dating, a heart-wrenching break-up, and a yet-to-happen make-up, Sheldon Cooper and Amy Farrah Fowler are finally going to have sex this season.
ET caught up with "Big Bang's" It couple on the set of the landmark episode, and star Jim Parsons was quick to make jokes about Sheldon and Amy's highly-anticipated moment.
"Putting the 'bang' into the theory, I guess," the actor said causing his on-screen love interest, Mayim Bialik, to burst into laughter.
MORE: Sheldon and Amy Are (Finally!) Going to Have Sex on 'Big Bang'
Clever puns aside, Parsons revealed that when he first discovered that Sheldon and Amy were finally going to embrace the intimate side of their relationship, he was stunned.
"I was very surprised," Parsons admitted. "But then I read it, and it seemed absolutely the right time."
In the episode, which airs Dec. 17, it's Amy's birthday and Sheldon gives her a present that she will never forget.
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