Most Helpful Guy
honestly I believe it's socially ingrained into a lot of people.
in a physical aspect, some enjoy the smooth, "fit" stomach, as a lot of the time, it is difficult to maintain. "Flat" generally (and stereotypically) means healthy to most people, and so I think it is more the symbolism that it represents.
Having a flat stomach means that (probably) the person works out and does well for themselves. And in a society angle, based on all the media and movies, it's what's to be "desired." all depends on the place really.
I'll admit the flat stomach is generally not my thing XD.2
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.4