Michael Douglas says Matt Damon is a tender kisser.

The pair filmed gay sex scenes for 'Behind The Candelabra' and the 68-year-old actor admitted he enjoyed locking lips - even if the 'Promised Land' star joked he imagined Michael's wife Catherine Zeta-Jones.

The 'Wall Street' star told the Mail on Sunday newspaper's Event magazine: ''Matt says when he kissed me, he thought of Catherine. She was very pleased by that ... I thought of Matt.

''There was a tenderness about him. The way he kissed.''

Michael commended his co-star, calling him ''brave'' for taking on the risqué role at the ''prime'' of his success.

He explained: ''When Steven [Soderbergh, the film's director] told me Matt wanted to play Scott I thought, 'Wow, that's brave'. It's my time to do what I want, but he is Mr. 'Bourne Identity', in the prime of his leading-man career.

''Matt's in a group of really impressive - Brad [Pitt], George [Clooney], Matt and Ben [Affleck] - willing to take chances. It surprised me - in a good way.''

He also revealed Matt became ''too obsessed'' with body waxing for the role.

He joked: ''Matt got a bit too obsessed - thee was one point I was getting worried about him.''