I am more than a little bit in love with the new boy on Glee.
He and Quinn better get together. That's all I have to say.
This bell curve basically posits that bulking up—pumping iron, getting cut, what have you—will only make you more attractive to a certain point. Pass this point, and it will begin to have the opposite effect. (I'm pretty sure bell curves are usually for averages, but if the graph fits...)