Gwyneth Paltrow Reveals All in 'Thanks for Sharing'

The actress discusses her sexy new role in the film about battling sex addiction.
2:45 | 09/19/13

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Transcript for Gwyneth Paltrow Reveals All in 'Thanks for Sharing'
Gwyneth paltrow has a new film opening tomorrow. Called "thanks for sharing." It's about battling addiction. He will be sharing more of herself than we've ever seen before. And nick watt's on it. It must be good. He spoke one-on-one with the oscar winner and cookbook author, all about this revealing new role. Would you care for a little goo? Reporter: These days, gwyneth paltrow shoots just one movie a year. "Thanks for sharing." Playing a sex addict's girlfriend, opposite mark ruffalo. Isn't that something that guys say when you're caught cheating? Reporter: Complicated. There's one scene in the movie that, imagine your husband might have some issues with. Well, he's very open-minded. Mark ruffalo's wife won't see the movie because of that scene. Reporter: Really? Yeah. Reporter: And through her lifestyle blog, paltrow just launched a fashion line with stella McCartney. I saw you kissing stella McCARTNEY. Is there something I should know? The collection is called stella McCartney x goop. Reporter: She is happily married, with chris martin. How do you make that work? It's not easy to be married for ten years. We laugh a lot. So far, we're sticking it out. Reporter: Paltrow has a lovely life, great taste, and some food ideas. Now, we'll do the guacamole. A lot of people love that. A few do not. There's some haters out there. Oh, yeah. I don't engage, to be honest. I really don't. That doesn't help me in my creative process. Reporter: On the other side of that, it must be odd to be named the world's most beautiful woman by "people" magazine. How do you react to that? I just turned 40. I've got two kids. And I thought, this is so nice for all the mothers in the world. Reporter: I myself just turned 40 and slightly losing my beach body. What is your secret? My secret is incredibly hard work and discipline. Reporter: And she works harder when there's an upcoming lingerie scene. Your character says what I think a lot of the audience will be thinking. Is sex addiction actually real? The short answer is yes. We're all kind of half good and half bad. It's all a gray area. For me, it's interesting to see people who are in the struggle to become the better versions of themselves. Reporter: For "good morning america," nick watt, abc news, los angeles. Thank you, nick. And gwyneth. "Thanks for sharing," in theaters tomorrow.

This transcript has been automatically generated and may not be 100% accurate.

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