Because we wear clothing over that part of our bodies most of the time, and because we have fabric over a lot of our things. If we didn’t wipe, our clothing and furniture would be quite the mess.
Compared to a more natural environment where we’d be naked, and being scrupulously clean down there isn’t such an urgency. If you look throughout the animal kingdom, most animals have either adapted a way to clean themselves, or have adapted in a way that they don’t have to. Cats and dogs clean themselves and each other. Others like cows and horses simply evacuate their bowels/bladders and walk away. No cleaning required.
We require additional cleaning, and we can’t wait for things to dry up and fall off before we get dressed again.
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