muscle contraction/relief + removing toxins?
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Did we need a pleasure incentive for that? If you carry something really heavy and then release it, it feels good, but it doesn't feel pleasurable. Breathing is necessary but doesn't have a pleasure incentive either.
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Easy. When you need to go, you move slower, are distracted -> worse combat ability and hence survival chances. Over time, those who felt good upon relieving themselves, did it right away, maximizing comabat readiness and therefore surviving more frequently. QED.
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So what you’re saying is that the pleasure poopers were the alphas?
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