Liam Hemsworth thinks sex scenes are ''scary''.

The hunky actor - who is engaged to Miley Cyrus - filmed bedroom scenes with Johnny Depp's girlfriend Amber Heard for new movie, 'Paranoia', and found the experience rather daunting because of all the crew members on set.

He revealed: ''Intimate scenes are always pretty scary. Being intimate with someone in front of a lot of people, it's hard to let go and be free in the scene.''

However, according to his leading lady, Liam has nothing to worry about as Amber insists he made it ''extremely easy'' to act out their passionate moments.

She explained to TV show 'Entertainment Tonight': ''I think the key to doing scenes of a romantic nature, doing them comfortably, is to be friends with the person you're working with. If they make you comfortable and if you're comfortable being around them, you'll laugh through it and have a good time.

''It's not awkward if you're buddies with the person you're working with. Fortunately Liam, being the person he is, made it extremely easy to do [the scenes].''

The 23-year-old hunk recently revealed that the film's cast and crew pulled a naughty prank on him while shooting the steamy scenes.

He said: ''I get into the bed and they say, 'Action'. Then, I turn over and I grab what I thought was Amber's arm and it was a giant [sex toy]. It was big ... a black one. I pulled it out and everyone was in on [the joke] except me.''