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Ah, I am so glad you asked that, Messaline. It is an extremely good question.
It is very simple, you see. The combination of generous amounts of subcutaneous adipose tissue in the female gluteal region, along with a high inter-ischial distance, characterised by by a wide pelvis, signifies increased fertility and thus enhances the sexual desirability of the owner of the aforesaid pelvis to any observing male bipeds of the
homo sapiens genus.
I trust that clears up this question definitively.
- Professor Hieronymus Wragg, UVM