dated from 2008 to 2010, and their characters on the show were also dating. When the two split, the show writers already had a plan for Penny and Leonard’s on-screen split as well. For many couples, a split doesn’t necessarily stop hook ups or the occasional getting back together — which is what started happening with Cuoco and Galecki’s on-screen characters after the end of their real-life relationship.“All of a sudden, we started noticing there were extra makeout scenes for our characters, and/or sex scenes,” Cuoco told Vanity Fair while doing press for Jessica Radloff’s new book “The Big Bang Theory: The Definitive, Inside Story.”“I was like, ‘I think Chuck is f—king with us!’ We were convinced.