Matt Damon has revealed that Michael Douglas is a "wonderful kisser".
The two actors play lovers in a new TV bio film Behind the Candelabra on the life of flamboyant piano player Liberace (played by Douglas).
In an interview with Playboy magazine, Damon said he almost turned the risque film down because of being a dad to young kids.
"Well, normally I'd say no to nudity but I just did a lot of it playing the long-term partner of Liberace, Scott Thorson, in Behind the Candelabra. I mean, it's tastefully done. Steven Soderbergh directed it. But this movie's not going to be for everyone," he said.
Damon said he and Douglas both have a lot of gay friends who they used as research for the roles.
"It wasn't the most natural thing in the world to do, though. Like, for one scene, I had to come out of a pool, go over to Michael, straddle him on a chaise longue and start kissing him. And throughout the script, it's not like I kiss him just once. We drew it up like a football plan.
"Michael was a wonderful kisser. My concerns ended up mattering a lot less once we were filming."
The Bourne Identity star also said he had once sought advice on how to play a gay man from Heath Ledger after his much-lauded performance in Brokeback Mountain.
"I remember asking Heath Ledger after Brokeback Mountain, 'How'd you do that scene with Jake?' - meaning the scene where they start ferociously kissing.
"He said, 'Mate, I drank a half case of beer in my trailer'. I started laughing and he goes, 'No, I'm serious. I needed to just go for it. If you can't do that, you're not making the movie'."