It would have been understandable if Sam Mendes found it difficult directing his wife in a love scene with another man.
But it seems the director really wasn't bothered by Kate Winslet's intim-te moments on set with Leonardo DiCaprio.
In fact, he was so relaxed about the issue that Miss Winslet 'freaked out' instead, her co-star has revealed.
DiCaprio, 35, worked on in Revolutionary Road in 2008, with actress, 34, and her director husband, who recently announced that they were splitting up.
And when asked if the filming had marked the beginning of the end of their marriage, DiCaprio admitted: 'It was certainly a difficult time. She was really worried that Sam wasn't bothered by the fact that his wife was making out with another guy right in front of her.
'I told her it was only acting, but she kept on saying, "This is really weird".
'When Sam started telling her exactly how to have s-x with me she didn't like it at all.
' She was freaking out because she was supposed to be having s-x with her best friend - me - while her husband directed.
'But I didn't find it weird at all. It didn't bother me, because that's part of acting.'
Miss Winslet and Mendes, 45, have never given a reason for ending their marriage. They wed in a secret in the Caribbean in May, 2003 and their son Joe was born that December. The Oscar-winning actress also has a nine-year-old daughter Mia by her first husband Jim Threapleton.
DiCaprio, who has been friends with the actress since they starred in Titanic in 1997, added: 'She loved being a wife. Some people are meant to be married and I think Kate's one of them, but Hollywood and this movie business can be a killer for marriages.'
DiCaprio has been dating Israeli supermodel Bar Refaeli off and on since 2006. But he told Reveal magazine: 'I don't know whether I'll ever get married. I've seen too many supposedly happy marriages go down.'
