"I love pushing, I love scaring myself. I really wanted to do the sex scenes. As long as you're being really honest, there's nothing ever to be ashamed of," contactmusic.com quoted Stewart as saying.
The 22-year-old actress was just 16 when she was cast as Marylou in the big screen adaptation of Jack Kerouac's classic novel. She is, however, relieved the filming got delayed for a few years.
"I was terrified of this part. I knew I was going to play Marylou since I was 16. And thank god, I got to grow up a little bit because I was a much younger 16 year old than LuAnne (Henderson, who the character is based on). We made the movie when I was 20, the perfect point," she said.
Stewart, best known for playing Bella Swan in the 'Twilight Saga' franchise, says working on "On the Road" was just as serious as her efforts in the vampire film series.