LOS ANGLES: Scarlett Johansson and Ryan Reynolds have a rule not to talk about their respective careers when they are at home.

Scarlett Johansson and Ryan Reynolds refuse to discuss their careers with one another.

The couple - who married in a secret ceremony last September - insist the key to making their relationship work is by banning chats about movie making.

Ryan said: "We don't have a lot of work talk around the house. We both prefer to just be ourselves at home. There's no competition between us - we just don't talk about it."

Ryan and Scarlett are not the only couple to refuse to discuss movies.

Sam Mendes - who directed wife Kate Winslet in 'Revolutionary Road' - says he and the 'Reader' star avoid talking about their work - but only when they are doing something together, insisting it is relaxing to swap stories about their day on set.

He said: "When you're not working together, it can be really enjoyable because you're hearing what's going on on the set and what her problems might be tomorrow, and that's really interesting, and I do the same with her.

"Working together, you're both full on. There isn't one who's relaxing and pouring the other a glass of wine and saying, 'Put your feet up and let's have a talk about the day'. You're both too tired."