Scarlett Johansson persists on a no-nudity clause in all her films deals. The dazzling 22-year-old wants to be considered as a serious actress and now won't accept any role without that condition.A source said to the Britain's Daily Express newspaper: "Scarlett is still very young and is aware the roles she takes are going to set out where her career as an actress takes her in the future. "She doesn't want to fall into being too controversial or too trashy so nude scenes are out for now." Nevertheless, Scarlett may have to re-evaluate her naked clause if she wants to portray superstar Jenna Jameson in a film version of her autobiography 'How To Make Love Like A Porn Star: ACautionary Tale'.