This movie stars Sean Young and Patrick Bergin, directed by Lizzie Borden no kidding. I am not sure what direction the actors were given for this spanking scene but I think she got off light. This spanking is for trying to stab him with a very large knife.
If you take note Patrick smacks Sean pretty solidly and on the left cheek to boot. After the spanking there is a scene where Patrick gives Sean a bath.
After gently bathing her with a washcloth he asks her to stand so he can take a picture. She stands up like Venus rising from the ocean. My favorite bit is the subtle coloring remaining on her left cheek. Just a little pink and slightly bruised.