Why are humans the only animals that need to wipe? Did hunter-gatherers walk with dirty butts?
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Animals wipe their butts as well. With their tongue. That is why they periodically clean their buttholes with their tongue. They are wiping.
But probably yes, between whatever they did for cleaning they likely just had dirty asses. Just like people tended to be much dirtier in the past as well, and improperly cleaned.
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