So how come that our asses evolved to the point that in case somebody does not wipe properly they are gonna wake up with smelly fingers? All this extra effort while most animals are just going on with their lives after taking a dump without any rashes or ichyness. What are the evolutionairy benefits for this behaviour if there is any ?
In: Biology
In addition to the other comments, consider something else – walking on two legs instead of four. Since humans walk upright, we need big, strong leg and hind muscles. In fact, the gluteus maximus (the butt) is the largest single muscle in the human body, and is much bigger in humans than our primate cousins. According to some sources, in fact, the human has one of the largest butt-to-body ratio in the animal kingdom. As you might imagine, having a longer, thinner channel that feces has to pass through causes more of it to get left behind.
TLDR – Humans have big butts, and it’s hard to squeeze through without leaving a mark.
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