The blossoming romance of Sheldon (Jim Parsons) and Amy's (Mayim Bialik) love affair will continue in the midseason premiere of "The Big Bang Theory" season 9.

Sheldon and Amy will surely level up their relationship as they take their affair on the sheets on the "The Big Bang Theory" season 9 episode 11, titled "The Opening Night Excitiation."

According to Design N Trend, Steve Molaro, the show's executive producer talked with TV Guide about what it was like to write Amy and Sheldon's sex scene.

"We all love these characters and we knew this was a big moment for them and the show, so we were just trying hard to get a version right that we could hopefully all feel good about," he said.

Molaro admitted that the sex scene wasn't the only option they considered for Sheldon and Amy, as they also considered for them not to engage in such an intimate moment because Sheldon avoids physical contact even if he has been with Amy for five years.

"Either one was completely legitimate way to go, but I think Amy's been waiting, you could say, five and a half years. That might be enough time ... We started thinking about it a few years ago. It was sort of floating quietly in the back of our minds. It was just figuring out when was the right time to do it," he continued.

"We try so that it's not such a shift that it doesn't even feel like that character anymore. That's something we do keep in mind quite a bit, especially when we do big episodes like this," he said, referring to the characters being their usual selves after the episode is done.

Meanwhile, International Business Times gave a sneak peek on the midseason premiere of "The Big Bang Theory" season 9 episode 12 entitled "The Sales Call Sublimation." After Sheldon and Raj's (Kunal Nayyer) argument in naming an asteroid they found, Sheldon skypes Amy who is away for a neurobiology conference to tell her that he has decided to name the asteroid after her.

Leonard (Johnny Galecki) and Penny's (Kaley Cuoco) relationship is also on the rocks as the episode features the couple going to therapy to address their marital conflict. Penny also addressed Sheldon as a "man-child" living with them and became annoyed when the therapist told her that Leonard talks about him a lot.

Catch "The Big Bang Theory" season 9 episode 12 on Jan. 7 at 8pm EST at CBS Network.