'Big Bang Theory' cast shares NSFW behind-the-scenes secrets on 'Late Show' following series finale

Following the emotional series finale of The Big Bang Theory on Thursday, the cast of the beloved CBS sitcom joined Stephen Colbert on The Late Show, and things got surprisingly risque.

Kunal Nayyar, Kaley Cuoco, Johnny Galecki, Jim Parsons, Mayim Bialik, Melissa Rauch and Simon Helberg all took the stage where they dished on the show coming to an end, while answering questions and sharing some secrets about their time on set over the last 12 years.

One of the most surprising of Colberts questions came "from an anonymous member of the group, for the entire group," meaning one of the stars sitting on stage: "Did anyone have sex in their dressing room? [Answer with a] show of hands."

While no one was in a hurry to admit to that, both Cuoco and Nayyar pointed a finger at Galecki.

"You must have," Cuoco and Nayyar said nearly in unison as Galecki slowly and bashfully raised his hand.

"And that did not include me. Just FYI," declared Cuoco, who had previously been in a relationship for two years with Galecki while filming the sitcom, before they broke things off in 2009.

"Actually, we all just used Johnny's dressing room," Helberg later quipped.

Not all the questions were raunchy, however, including Colbert's first lighting round query regarding the cast's favorite guest star.

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The "Big Bang Theory" cast steps out for the series finale party
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The "Big Bang Theory" cast steps out for the series finale party
PASADENA, CALIFORNIA - MAY 01: Kaley Cuoco attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Johnny Galecki attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Jim Parsons attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Karl Cook and Kaley Cuoco attend the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kunal Nayyar attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Johnny Galecki (R) attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Mayim Bialik attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Melissa Rauch attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kunal Nayyar attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Sarah Gilbert attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Jocelyn Towne and Simon Helberg attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Anne Prince and Wil Wheaton attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: John Stankey, Chuck Lorre, Kaley Cuoco and Peter Roth attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Chuck Lorre and Kaley Cuoco attend the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kevin Sussman and Whitney Rice attend Series Finale Party For CBS' "The Big Bang Theory" - Arrivals at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)
PASADENA, CALIFORNIA - MAY 01: Casey Sander attends Series Finale Party For CBS' "The Big Bang Theory" - Arrivals at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)
PASADENA, CALIFORNIA - MAY 01: Chuck Lorre and Arielle Lorre attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Anne Prince and Wil Wheaton attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: David Theune attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Courtney Henggeler attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kate Miccuci attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: June Squibb attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Kevin Sussman (L) attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Laura Spencer attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Steve Holland and Steve Molaro attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Levar Burton attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Keith Carradine attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Andrea Roth and Peter Roth attend the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Bob Newhart attends the Series Finale Party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
PASADENA, CALIFORNIA - MAY 01: Rati Gupta attends the Series Finale Party For CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Alberto E. Rodriguez/Getty Images)
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"Judd Hirsch was a big deal for me," Galecki recalled. "We ran into him at some function and I ran up to him and I said, 'I'm such a massive fan of Taxi, and your role on that,' and I kind of tried to base the purpose of my character on the purpose of your character,' and I said, 'Do you want to play my dad?' And then I realized he might not have any idea what show I'm talking about or that I'm an actor even!"

"Mark Hamill was pretty exciting, and Bob Newhart," Bialik offered. "I grew up watching Newhart, that was one of my earliest comedy inspirations."

Colbert also asked questions that had been submitted by Big Bang Theory fans via Twitter, including, "What was Penny's last name, before she married Leonard."

"There really is no answer. She's Cher," joked Cuoco, who played Penny on the series. Penny's last name was never mentioned during the show and became a running joke throughout the series' run. 

However, even with The Big Bang Theory over and done with, the actress said she's still never revealing Penny's surname, adding, "I became a little superstitious after a while."

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'The Big Bang Theory' stars on Instagram after final taping
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'The Big Bang Theory' stars on Instagram after final taping
Final group scene 💕 That’s a wrap 😭 @bigbangtheory_cbs
knock, knock, knock, thank you... Thank you, apartment 4A, for being a home to so many dreams come true, to so many friendships made. And thank YOU, ALL of you - yes, YOU, reading this right NOW! As we get ready to tape our final episode tonight, to walk in and out of this apartment door for the last time, it is hard to find the words to articulate what a profound experience this has been. But the words “love” and “gratitude” come to mind... so love and gratitude to all of you. ALL of you. Thank you. ❤️ (oh! and happy birthday to @sanctionedjohnnygalecki and @kunalkarmanayyar - talk about good timing... may your next 12 years be as vibrant and wonderful as the last 12 years in which i’ve had the pleasure to know and work with you both 🎉)
It is an overwhelming day to say the least. All of the feelings: gratitude, sadness, joy, excitement, grief...it's the end of a huge part of our lives and the beginning of who knows what. Thank you to the millions of people who love this show. Thank you for the lessons we have learned from you all. Thank you to our writers for caring so very much about these characters you all believe in and trust. Thank you for making our family a part of your family's laughter, tears, and challenges. I get to play dress up for a living and I am so honored to be a part of this cast, this crew, this staff, and this wonderful show about how these brilliant characters live, think, and love. It all started with a big bang. ❤️💥
#SimonHelberg and I have logged so many hours talking about acting and theater and film and everything we’re passionate about and have been blessed to be able to do for a living. One of the funniest people I’ve ever met, on screen and off. With all the phenomenal success of the show, Simon’s passion for the work has never changed. Still exploring. Still asking questions. Still doing spot on impressions of Christopher Walken that make you spit your milk out. Love this guy.
💛 Forever 💛 @kaleycuoco @kunalkarmanayyar @missmayim @therealjimparsons @sanctionedjohnnygalecki #simonhelberg
Thank you Thank you for your words Thank you for your encouragement Thank you for tuning in night in and night out Thank you for the stories you shared about how this show made you feel Thank you too, for the not so nice times Thank you, for lifting us up when we were down Fame can feel like a cage, so Thank you for making us feel safe enough to be free. Thank you for letting me share my birthday on stage with my six best friends, And Thank you, for you, because without you- there would be no us. So this goes out to you, the fans... One last time. In love and gratitude, -Kunal
💫 Final bows tonight 💫 @bigbangtheory_cbs
This set. Getting packed up. 😭
You know you work with wonderful and extremely thoughtful people when they celebrate your June birthday along with today’s birthdays (@kunalkarmanayyar @sanctionedjohnnygalecki ) because you won't be together when it comes around this summer. 📸 by the lovely and talented: @ansleyrix
While Stuart may have taken up residence in the Wolowitz household @kevsussman took up residence in a special place in my heart 💕 #Repost @kevsussman with @get_repost ・・・ The friends you make along the way... One of the best things about showing up to Stage 25 all these years has been seeing @themelissarauch ‘s smiling face.
Leonard Hofstadter, PhD.
Do @kaleycuoco and I look like we’re keeping it together? Took this right before our final speed read. Before our final taping. Before my final emotional breakdown. Gonna miss working with Kaley so much. Sometimes you get to work with an actor that's so thoroughly in the moment that you can look to them at any time to ground you - Kaley has been that for me for eleven years. ❤️
Gonna miss napping next to @missmayim. We nap in adjacent dressing rooms, so we simulated what that would look like if you removed the wall. Did I mention that Mayim’s room is also where I’ve had some of my most productive psychotherapy sessions? Thank you Dr. Bialik. ❤️
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