( PEOPLE.com ) -- The pivotal sex scene in the new `` Twilight '' film , `` Breaking Dawn -- Part 1 '' is so steamy that the MPAA originally gave the film an R rating , according to its star Kristen Stewart , who says even she was shocked by what her character does between the sheets . `` There are two big sex scenes in the two [ final ] films , and we did them fairly early , '' Stewart , 21 , tells the U.K. edition of Glamour . `` It was so weird , it did n't even feel like we were doing a scene within a 'Twilight ' film . I was like , 'Bella ! What are you doing ? Wow ! What is happening here ? ! ' It was very surreal . '' Off-screen , Stewart 's sex life is also of interest , particularly her relationship with `` Twilight '' costar Robert Pattinson , which Glamour describes as `` likely-but-never confirmed-nor-denied . '' Though the actress -- who 's currently shooting `` Snow White and the Huntsman '' -- certainly is n't a fan of such attention , she seems to take it in stride . `` People can say whatever they want , '' she says , calling the interest `` totally understandable . But when it 's personal to you , it 's like your life becomes a product , and I 'm repelled by that . I do n't like to give away gems that people are gon na be like , 'Oh my God ! ' So I 'll always just shrug it off . In fact , I always find it kind of funny , and not just with Rob . '' Only 17 when she was first cast as Bella Swan in the `` Twilight '' saga , Stewart says she 's finally starting to feel comfortable doing interviews , but that it 's `` a fair assessment '' to say she often comes off as shy and nervous in public . `` I was young , not expecting it and trying way too hard to be 'not fake , ' `` she says . And as far as the devotion from her fans , Stewart says it 's something she can relate to . `` There are definitely people that kind of lose it and get very emotional , '' she says . `` But recently , I met [ musician ] Jenny Lewis , and I had the most ridiculous experience . I was so embarrassing , I could n't speak . It was eye-opening , actually . '' See the full article at PEOPLE.com . © 2011 People and Time Inc. All rights reserved .
Kristen Stewart says even she was shocked by what her character does between the sheets . Off-screen , Stewart 's sex life is also of interest . She is currently shooting `` Snow White and the Huntsman ''