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[–][deleted] 16 insightful - 3 fun16 insightful - 2 fun17 insightful - 3 fun -  (0 children)

Because they think it's more abdominal muscles and not the superficial layer of the uterine lining no longer receiving blood vessel support so that it can shed. The menses are driven by progesterone too, which they seem to completely be ignoring. Needing to poop isn't a period.