Actor Daniel Radcliffe has described a steamy gay sex scene in his new film “something new.”

Radcliffe (Harry Potter) plays gay beat generation poet Allen Ginsberg in John Krokidas' thriller Kill Your Darlings, which premiered Friday at the Sundance Film Festival in Park City, Utah.

Radcliffe told E! Online that Krokidas put him at ease while filming the scene.

“It was something new,” he said. “But you know what? We shot that whole scene in maybe an hour and a half so it was incredibly fast-paced. I didn't really have time to stop to think and worry about it.”

“John was very helpful in furnishing me with a lot of graphic detail of what I would be experiencing at the various stages,” he added with a laugh.

Radcliffe added that he was able to “hang out a little bit on the set” with the actor who plays the sailor who Ginsberg sleeps with in the scene.

(Related: Daniel Radcliffe, James Franco, Jonathan Groff gay films premiere at Sundance.)