Inserting buttocks between hip and thighs doesn't have anything to do with anatomy. It's a workaround to make the crease between thigh and hip look more natural. The older Poser figures (P4 woman and man) - and, curiously enough, the P6 figuers - do not have buttock body parts. When you bend the P4 nude man/woman thigh forward, as in a sitting position, the crease between hip and thigh looks awful. Do the same with Victoria 2 and the crease looks much more natural. That's all there is to it.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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