Well, if you compare your girl to a bodybuilder, she doesn't have a lot of muscle either. I was talking relatively. Like, take an average Japanese girl and compare the hips (I googled Mao, for example, see below; not because I think she's "skinny in the leg department", no, she has nice legs, but I doubt the fat to muscle ratio is that much different; at the very least, I doubt all that additional girth is just fat, so, we could say that their legs
are muscular if by muscular we meant "having a lot of muscle as compared to an average JAV actress, not by ratio, but in general
And it must be hugely a taste thing as well (I mean, the girl in your photo is sexy, but her butt would only win if she had a bit of fat on top of that,
in my opinion). And if we're talking about flat, there is a big difference between a flat butt with narrow hips — and an equally flat butt with wide hips (which is the case for the first girl in the video clearly) since we're evolutionarily predisposed to value wide hips... at least it seems so to me. The more time I spend on this forum, the more I doubt myself
(Also, a natural question follows, for example: what is Shiori's butt's... composition (fat to muscle ratio etc.) and what about her legs? And if she has a lot of fat, would that matter to all those who like her butt? No. The same as it wouldn't matter to you since you don't look at fat asses. So, two words again: relative and subjective.)
Finally, if I'm being picky, "no muscle at all" is a gross exaggeration since if it were true, they wouldn't be able to walk at all (picture Ace Attorney shouting "Objection!.."). Which brings me back to my initial point about relativity. So, you meant, "no muscle at all [compared to my minimum requirements for muscle]". Which brings me to my second point about taste. So, essentially, the only point that you made is that you don't like "fat" girls, and I'm putting the word into quotation marks since it's, again, clearly subjective (just as my "muscular" description), or, if we put it all together...
...your post, corrected for subjectivity (in my opinion, of course), would read:
"I don't turn my head when I see [clearly subjectively] fat asses and legs. There isn't any girl with muscular legs in that video [if by muscular we mean compared to this picture of a Western woman who is likely focusing on her hips — and not to an average JAV actress who is more likely to just keep their weight within certain boundaries]. No muscle at all [to make a gross exaggeration since it would be impossible in reality]. ...her ass is flat. It's wide, but flat [as if it's such a problem since I wasn't talking about
curvy booty, I was talking about
great booty, which is even more subjective, so, you're not contradicting me actually, you're just giving your criteria in parallel — and by the way, I didn't say "muscular" about their booties, only their legs]. The shape is way different with [a lot of] muscle [, which is not the point of my post either — since, again, I meant "muscular as compared to an average JAV actress not a fit Western model"]."
P.S. Admittedly, this threat is about big booty, so... what is "big booty" actually? Does width count? Or only the curviness? If I'm not mistaken, "big" in this case means "big in volume", and we're not talking about fat/muscle/curvature specifically. So, "big" is the only "fixed" subjective parameter (and even it is subjective), and the rest are subjective and not even fixed... Damn, I do write a lot. But it's for research purposes