The Australian actor, who used to play Geoff in Home and Away but more recently played a vice queen's toyboy lover in crime drama Underbelly: Razor, said that he tried to stay "relaxed" when taking his clothes off.
Lewis told OK! magazine: "That was my second sex scene, but by far the most intense. I didn't know what to expect, but I tried to be as relaxed and professional as I could.
"Danielle Cormack, who plays Kate Leigh, was amazing, because she's done a couple of those types of scenes before. The plan was to just go for it and have fun, and I think in about two takes, we'd nailed it - quite literally!"
Lewis is currently dating Home and Away actress Rhiannon Fish, who plays April in the soap. He said that filming raunchy scenes for Underbelly was good revenge for all the romance scenes she has to do at work.
"Every day I have to see her kiss someone," he said. "Now I'm finally coming up with some payback!"
He added that the couple's relationship is "great", admitting that she was the main thing that "drew" him to move to Sydney recently.
Lewis is scheduled to make a special appearance in Neighbours soon, but said that he has not ruled out a return to Home and Away in the future.
"I get asked that question every day," he said.
> 'Underbelly: Razor' slammed by child psychologists