I was thinking it's like a thrill thing, like she wears them in public for the thrill of being caught but never actually uses them. Or maybe she does. It's your character so do what you want with her.
As for the teacher think statuesque blond guida who I swear must have stripped her way through college. If you've seen Scarlett Johansson from Don Jon you've got her, just less accent and more more meat on her bones.