Like most of their other co-stars from The Big Bang Theory, Kaley Cuoco and Melissa Rauch enjoyed a close friendship on and off the CBS sitcom set. Big Bang Theory star Kaley Cuoco has admitted to struggling with filming a sex scene in her edgy new TV series thriller. Lucy Murgatroyd and The Sun 2 min read November 30, 2020 - 5:41AM Kaley Cuoco revealed that she had to be coached by her co-star to get her through her “first true sex scene” in her new series, The Flight Attendant.