Curiosity afoot~I am barely 100lbs and am unfortunate enough to be endowed with natural G cups. I take a 28 band size though, which means my breasts have the same volume as someone who wears a 36DD to put it in perspective.
More on subject, but when I was younger I kind of fell into the trap that bigger women naturally equate to bigger boobs. As I got older, picked up a bit of life experience, and also explored some more specific fetish sites, I came to realize my physical dream girl is probably just that: a dream.
Perverted observation of local females when in public rarely has me seeing anyone above a D. I don't partake in the "more than a handful is a waste!" mentality, but sometimes my lusts wishes nature was a bit more giving of the eye candy. I also don't think implants are an abomination, but that's a whole 'nother can o' worms.
Seeing what most here would probably call skinny girls calling themselves fat is another issue. I've probably learned you should never call a woman a cow, and even if she says she is one out of frustration, trying to console her never seems to work in your favor since their mind is usually made up to begin with. I guess needing to shop at a plus size store is a good starting point for "fat", but not everyone carries weight the same, either.
Personally, I know I'm not the largest guy here. "Husky" would probably be my qualifying term, and short of being paired up with a nice lady that loves to cook, I'll probably remain that way since my figure's a result of eating whenever I want to without really care for what it is as long as it's not gross. Doesn't mean I don't fantasize about being bigger, though.