What is the evolutionary reason behind pooping feeling so good?
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I was thinking that might be the reason, actually. Because, sometimes, it feels really not good, we needed it to feel good the rest of the time. Otherwise we'd avoid it, which would not be good.
My other theory is that, in order for pooping to not be detrimental to the rest of your village, you need to do it in a designated place (i.e. not upstream) and that's kind of a pain to deal with. So maybe the pleasure is designed to let you justify a long walk or something.
