Not many actresses willingly flaunt their bodies in their 40s, let alone after they've had a baby, but Nicole Kidman, 44, not only doesn't mind showing off her physique, she admits to even enjoying it. In an interview with W, the star of the upcoming HBO biopic "Hemingway & Gellhorn" opens up about going nude for movies, her most memorable sex scenes, and what brought her closer with her husband, country singer Keith Urban. When asked about her propensity for filming scenes in the buff, Kidman — who has taken it all off for "Fur" and "Eyes Wide Shut" — admitted, "I don't mind being naked. Maybe as I get older, and now having had a baby, it might be different, but I enjoy not letting my issues get in the way of a performance. Once I start putting all my little insecurities in my mind, I'm not actually acting. Then it's about me — and it should never be about me. It should be about the character."

Due to some of the sexually-charged scenes in her films, Kidman's family doesn't get to see everything she does. Her mother Janelle, who she describes as "tough on me," is a fan of "The Hours," for which Kidman won an Academy Award, and the musical "Moulin Rouge," but she was not a fan of "Fur," the 2006 biopic about "photographer of freaks" Diane Arbus. In it, Kidman actually shaves Robert Downey Jr.'s character, a man who suffers from hypertrichosis and is covered head to toe in hair — and then has sex with him. "I am the only person who has ever gotten to shave Robert Downey Jr. naked. Nobody else can say that — not even his wife!"

More photos of Nicole and Clive in W

Sex happens to be the theme in Kidman's latest project, which co-stars Clive Owen as Ernest Hemingway to her journalist Martha Gellhorn, the writer's mistress-turned-wife. In the HBO film, the two spend years reporting from war-torn countries, while also maintaining their intense passion for each other. "The sex was very important in that relationship because that's the way she cuts Hemingway off," Kidman explains to W.