Dakota Johnson says she knew she wanted to play Anastasia Steele in Fifty Shades of Grey even before she read the popular erotic novel trilogy.
Her resolve only strengthened once she had a chance to.
"I just really understand it," Johnson said of the coveted role she's been given. "I think it's an incredible love story, and that's why it's affected so many people."
"Erica [author E.L. James] did a really good job of explaining how that can happen, you have this chemical pull to someone. The sex makes it perfect."
"Sometimes you feel a little bit naughty, and that's okay."
The actress, whose parents are Melanie Griffith and Don Johnson, says no one except her boyfriend, actor Jordan Masterson, knew she was even up for the part.