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We...an older generation (lay and professional) were taught that as the uterine lining (endometrial) became
-unemployed- it also and pari passu became 'fouled', unclean and so, needed out.
Entrenched beliefs....received wisdoms.
The menstruation/isolation sheds of older or more primitive cultures also catered to some of this but actually had most of their benefit in limiting perhaps riskier sexual contact in that 'period'.
At least I so believe..as a physician....
But don't actually know...Is there benefit, as for sort of an internal 'skin'..of regular defoliation?
And with none of this going to the anemia to which menstruating women are prone...OR their avoiding iron- overload syndromes...and stuff.
Need some science here folks...not lore.
Salon could do that for us...and will, I'm sure, as able.