Michael Douglas says it is tough filming sex scenes because ''everybody is a judge''.

The 68-year-old actor believes cast, crew and eventually moviegoers are more critical of love scenes because everyone can relate to erotic acts, as opposed to action and shooting scenes.

Michael - who has a gay sex scene with Matt Damon in new biopic 'Behind the Candelabra' about pianist Liberace - said: ''The hardest thing about sex scenes is that everybody is a judge. I don't know the last time you murdered somebody or blew anyone's brains out, but everyone has had sex, and probably this morning, which means everyone has an opinion on how it should be done.''

The Hollywood veteran was diagnosed with stage four throat cancer in 2010 from which he has made a full recovery.

Michael - who is married to Catherine Zeta-Jones, with whom he has two children, Carys, 10, and Dylan, 12 - now wants to make the most of his life and career while he can because he now knows how fragile life is.

Speaking to The Sunday Times newspaper, he said: ''In the past, on purpose, I've never known what movie I'm going to do next. I never knew how it would feel when I finished a picture.

''Now it feels great to be back at work. Maybe that's the benefit of taking a break with cancer.''