Maggie Gyllenhaal insists it is "safer" to fall in love on-screen as somebody is there to shout "cut" at the end.
The actress married Peter Sarsgaard in 2009, and the pair have two daughters together. Maggie often plays characters that fall in love in movies, but admits she is much more guarded in her personal life.
"It's safer to be open like that when somebody is going to say, 'Cut,'" she explained in an interview with British newspaper The Telegraph.
"Obviously there are certain relationships in my life - my husband, a couple of dearest friends, my family - I can go really deep with. But I don't do it with everybody."
Maggie and Peter have performed alongside each other twice on Broadway. In both Uncle Vanya and Three Sisters, they've played characters involved in affairs.
The 34-year-old star was thrilled to be acting out such a highly-charged storyline with her real-life partner.
"Peter is the most exciting actor I've ever worked with in my life, hands down," she gushed. "So that's sexy. You're on the stage with him going, 'You're the one that I want.' Being on stage with him was wild."
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