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That is the most insane idea ever, Mox.
But you do kinda have a point. But it sees unlikely. They'd suffocate if they got constapated or something.
In the book, a full colour scale map (for the computer models) was shown of Abe. Buttocks were represented, but there was nothing in the front. The developers did actually colour all that was normally hidden by the loincloth, so I presumed they had nothing there, even for urinating.
The loincloths are worn for cultural reasons, whether it be fashion or a specific part of their history that is important to them.
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