Maybe it's because I follow "normal" looking AV actresses. If you watch Asuka Kirara or any girl with face and body surgeries, I agree, they don't look like everyday asian girls, and that's a good thing imo.
Yua, Shoko, Ai Sayama (+ diet for her, very good results), Masami Ichikawa and probably other girls hit the gym. What I wanted to say is that in the west, the fat asses are mistaken as the standard for "having curves" (thanks to dumb TV sluts and their fans). Being slender (like asian girls), you have less fat but it doesn't mean you can't have curves. Even tiny girls can show off a nice butt, here is a comparison :
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Another US girl, AJ Applegate (similar butt, bigger legs), goes to the gym but all you can see is fat, as she's fat first (eating american food lol). On the right, she doesn't even have to hit the gym to have that body. Her legs have more definition and makes her ass noticeable.