Most Helpful Girl
Appearance is the main thing that keeps a man interested in a relationship -- not just a new one, but one he's already in, too. I don't mean that it's the only thing that matters, but that it's the gatekeeper to letting any other trait matter to him. He may want an intelligent girl, but only if she's attractive first. He may love his wife, but if she gets fat, he won't be happy with her. Etc.