Humans are the only species to use bodywash every day as well. So it’s no surprise that we’re the only species that attempts to clean feces off our butts, as needed.
We are the only species to do a lot of things. If we question each one, it’d take a long time to explain.
To answer your question directly – **we are not the only species that “needs” to use toilet paper.** Ever been on a farm and seen dried poop on the backside of cows/pigs? No ~~animal~~ mammal butt on earth (including humans) is 100% free of poop residue. I’d bet that human butts are cleaner than nearly all other ~~animal~~ mammalian butts.
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