Why don't people wash their butt after pooping?

Anonymous
I always wondered? In my culture we grew up washing out asses and then drying it with toilet paper. We use like a watering can or a sprayer to clean our ass then use the toilet paper to dry that area (by the time were done the toilet paper we wipe our ass on becomes clear).
So why is it that people don't clean their ass like that? I mean, imagine if you got mud or nutella on your hand and instead of washing it off you wipe it with a toilet paper. Is it clean?
I'm kinda worried that if I were to have sex the guys dick might taste like pee or his ass hole have shit on it or smell like shit lol. I'm just so paranoid!
Why don't people wash their butt after pooping?
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