We wipe because we have massive ass cheeks that catch poop. We have such a massive dump truck compared to other animal because we walk on two legs.
Early hominids did have to wipe, and almost definitely did using leaves, barks, or washed in water, because while we only learned about germs and viruses, mankind has known about cleanliness for thousands and thousands of years with a slight break for a few hundred years after the black death because the lack of private bathing facilities led to bathhouses being hotbeds for plague.
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