Sam Rockwell and Kelly Macdonald

The star, who plays a sex addict in the new film, locks lips with Trainspotting star Kelly MacDonald - and admits he enjoyed the romantic scenes.

He says, "I think kissing scenes are more intimate than doing sex on film. The kissing scene with Kelly might've upset my girlfriend a little bit because we were really going at it.

"It was the last day of the shoot and she was a good kisser."

Source: WENN