Why are humans the only animals that need to wipe? Did hunter-gatherers walk with dirty butts?
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A greater need for that comes with upright posture, other animals don’t have their exit chute buried in butt cheeks which are prone to catching and smearing feces.
That said, we’re not the ONLY ones. There are plenty of species that have intermittent issues with poop clinging to fur, skin, scales or feathers and causing problems. Ever seen a dog drag it’s bottom on the ground or licking itself? Same idea happens in nature as well.
Both of those said: diet and body hair also plays into this. We have nothing like the diet of our ancestors. Even among people today some people have relatively little trouble while others are posting that Parks and Rec meme about the marker.
Our ancestors cleaned with what was available. Leaves, water, sand, a hand if they had to. No one likes diaper rash in any time period.
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