Yeah, it's one of those simple "facts of how life works." It's *CERTAINLY* true for girls, and honestly, it's true for guys too.
I can say for a fact that I'm treated better and with more respect when I am dressed more presentably, for instance. Not just from girls, but from guys too. Obviously, I'm just talking about "first impressions." I've in fact actively tested this theory to the best of my ability on several occasions out of mere curiosity.
Obviously, in the end, once people know me, they generally all regard me and treat me the same. Again, I'm just talking about the "first impressions," of course. Or the fact that, just as girls USUALLY can do, I find that it's easier to "get away" with more things when you are more presentable. I of course do not mean getting away with "illegal" or otherwise "unlawful," "unjust," or "improper" things, none of which I ever do. I just mean ... I find it's easier to pull strings and get favors granted, that's all.
HOWEVER: I would suggest an alternate theory to all this. My parents and close friends always say that it's not one's looks, rather it's one's CHARACTER. So one could argue that one's good looks and the resultant boost of self-confidence could improve one's character, but I think we can all see COUNTLESS examples of this *NOT* being the case. Just pick your favorite hot celebrity.
So to conclude, I *DO* maintain that in fact it is largely one's character, at least insofar as corporate positions and job placement are concerned. Put another way, all things being equal, yes, a better looking person will likely have a better shot at getting a better position. However, a person of lesser physical attraction but with vastly superior character will always prevail, I do think.
Just my 3c.

Thoughts?