Most Helpful Guy
She's not fat.
Mainly because it helps showing her curves, like if you look at her from the side, her boobs and stomach don't morph into one, like it happens with fat girls. And if you look her from the front, you can appreciate the hip/waist ratio, since there's little-to-no fat covering that area.3THIS IS NOT RELEVANT ANYMORE
Most Helpful Girl
Other than belly fat being the most unhealthy type of fat to have (it's the most unhealthy place to carry it) and that a flat stomach helps make the other fat deposits (boobs/butt) look better?
And biologically we're attracted to healthy figures?
Nothing, I suppose. Other than it makes her look healthier.4THIS IS NOT RELEVANT ANYMORE