i've heard stories about the attractive people being more distracting to the class. i myself am the reverse. i find drawing to be very sexual, and attraction helps hold my attention.
You have such a different experience of drawing than I did! I would have generalized mine but this gives me pause.
My experience of drawing and the way I was taught one had to look analytically and render lines, values, shapes. If I am drawing a woman's breast, to choose a part of the anatomy that carries erotic interest in the US at least, I would be considering the shape of the shadow beneath it, I might also use the nipple to place it in relationship to her eyes, mouth, etc.
It used to amaze me that when I would step back that there would be a drawing there and I would wonder who had done it for all I had done was try to render relationships onto the paper. Drawing seemed to me a very abstract thing and if the model was a woman I found very attractive it was hard for me to let go of her totality the gestalt of which was "beautiful desirable woman" and instead look to the particular abstract shape of the shadow, or the shape of the highlight on her breast, or cheek, or the apparent angle of her shoulder to her neck and thus lose my awareness of her body, momentarily, as a total and instead analyze what I was visually seeing.
Perhaps you draw differently, maybe they are teaching drawing differently?
lfen