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This is just a booty/butt/rear end/glutes that I modeled for some needs. Now I am sharing it with you. Very simple model. Includes some example materials. There is some simple UV unwrapping applied so that textures can be added (examples included).
There is also soft body physics applied with corresponding vertex weight maps for a pleasing bounce when animated at the scales provided.
Extra: The original, unmirrored, unsubdivided mesh.