My butt isn't flat because flat butts are horrible. Fat makes your butt round, and most people prefer this.
Be like Nicki Minaj and get a butt implant.
a flat butt
Not really if you work out your butt while doing it.
because that is sick...and just flat out weird
As you age, butt may flatten and lose shape due to lower amounts of flat in the buttocks and loss of collagen in the skin.
you pick your butt
Not an accurate answer but: it is said that having sex in the doggy style position lifts the butt.
Genetics controls the answer, there is always a chance to inherit anything.
You can't.
butt
The male pelvis is different for obvious reasons.
I guess you could do squats but anyways who wants a butt like hers . She has nothing it's flat