Christa Winsloe's novel Maedchen in Uniform was first filmed in Germany in 1933. The story, about a sensitive schoolgirl's lesbian attachment to her headmistress, was handled tastefully, albeit with remarkable frankness for its period. [rottentomatoes]
So the thing that makes a woman's body "sexy" (in the sense of being something you would accept for her contribution within a transaction) is not its curves, it's the fact of the female inferiority that disables that woman for contributing anything better
Harem Mistresses exhibit such absolute power over slaves, sometimes its easy to forget that they are still slaves themselves. She never forgets however, and grabs the defiant Feminist brat by the ear reminding her "you get whipped, I get whipped."