The `Kingdom of Heaven` actress is attracted to darker roles, and particularly enjoyed portraying the witch character Morgan le Temptress in TV series `Camelot`, for which she appeared naked, and bled from her eyes.
She told the Sunday Times newspaper: "She`s so ballsy. We don`t have a lot of roles like this. I don`t want to play girlfriends and love interests. It`s great to be almost like a man."
While she appeared naked in some of her earlier films Eva, 31, admits she now finds sex scenes difficult.
Speaking about 2003 film `The Dreamers`, she added: "[The nudity] was not pleasant. It`s more difficult now. If I have to do a sex scene, I feel very self conscious."
Eva first came to international fame playing Vesper Lynd - a femme fatale who proves a match for spy James Bond in `Casino Royale` - but has since shied away from blockbusters and big budget films, as can`t stand "3D films and fighting monsters".
She added: "If I don`t like something, I don`t think I can even perform. A movie is from my heart, my soul."