Shailene Woodley insisted on filming sex scenes for 'White Bird in a Blizzard' completely naked.

The 22-year-old actress admits she ''freaked out'' the crew and her co-stars because she wanted the scenes to seem ''real'' and have ''truth'' to it.

She said: ''It was so much fun. Everyone was freaked out because I'm nude, but in real life, when I have sex, I'm naked. I don't have a bra on, and I don't usually have panties on.

''So let's make a real movie! Let's bring truth to the scene!

''I didn't want to be exploited, but this girl - like most girls when they first have sex - doesn't know what she's doing. I wanted their first kiss to be sloppy, teenagerish making out. When you're younger, you think you know what to do, but you really don't.''

Shailene also admitted she threatened to promote her 2011 movie 'The Descendents' naked because she kept being given advice on what to wear to best improve her chances of an Oscar.

Speaking to New York magazine, she recalled: ''People were suddenly asking me all kinds of questions. What would my next movie be? What was I wearing? Did I think I would get an Oscar nomination? I was told to start dressing more 'cosmopolitan' for my 'campaign.' I remember saying, 'Are you telling me that if I dress a certain way, my chances are better for an Oscar? That makes me want to show up naked.'

''They said, 'Well - if you're naked, your chances will be very good.' ''