You poop out what’s left of what you eat. Your butthole and your mouth are part of one big tube with a lot of twists and turns in it where food has nutrients sucked out of it and what’s left is turned into poop.
Your pee doesn’t come from this system. It comes from your blood. Your kidneys filter your blood, and the water your kidneys pull out of your blood gets peed out of you.
So your butthole burns because the spicy chemicals that came in have to come out. They don’t get in your blood so when you pee later, you don’t have spicy pee.
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