The only thing left I can think of that keeps the woman from heading toward the clean, single, well-dressed male is the Seinfeld theory about such guys. But even then, I'm not sure why that would factor in. So I don't buy into that little notion about guys in relationships being made into better men. They made themselves as such to get the woman. Besides, I know guys who became bigger slobs within a relationship than they previously had been.
Any guy is capable of cleaning up and looking good.
Well, another boneheaded misconception is that the relationship guy isn't as much of a threat. See, I told you it would. Learn to trust me on these things. Anyhoo, the relationship guy is every bit the threat. In fact, the relationship guy is a greater threat if you ask me.