Uhhh.. Someone needs to define "obese" or "fat".
Fat/Obese to me is the same, and is definitely a *BAD* thing. This is where the person DEFINITELY wieghs far more than they should, and is quite disgusting to think of naked. On a chick, think boobs down to stomache fat, or the start of a ball.
I don't consider "big boned" girls to be fat by any means, it's perfectly normal. No need to be perfectly skinny, yeesh. I found one slightly larger girl (definitely not obese), very damned hot. She gave the best #@$#@4ing massages in the world, because she had enough strength in her hands to do it right.
Now my fiance is a little girl, but nothing too skinny. 5'3" and 110lbs. Mmmm. But, if she put on 25 pounds I wouldn't really care all that much. If she put on 100lbs, I would definitely mind as that is just downright unhealthy.
That said, I'm 6'0" and wiegh about 225.

So I'm getting a bit on the larger side myself, but nothing where it hinders my day to day activities (and yes, they do include more than sitting on my ass all day)
So.. just be sure you're all talking about the same thing. When I say "fat girls are ugly" I'm not talking about someone who's 5'2" and weighs 130lbs, I'm talking a 200lb+ monstrosity.
-Phil