The scene: you are an art student in a nude modeling class. I'm the nude model. I walk in with my robe on, stand in front of the class, and let my robe fall to the floor. I'm totally naked (obviously), and I get myself into many different positions for you to draw me. I notice you looking at me differently than anyone else in the class. So I give you a little extra attention / treatment during my time in the seat. I know you want to fuck me instead of just drawing me.