Carl Pyr­dum points indi­rectly at how things these days have gone to hell—just like they always have. In this case, “Oh My God, They Got Medieval On South Park! You Bastards!”:

But back to the hor­ri­ble sac­ri­lege of the actual South Park episode. I couldn’t find any exam­ples of the Virgin’s men­strual blood being ven­er­ated in the Mid­dle Ages, unfor­tu­nately, though not for lack of try­ing.**** The clos­est I could get was to her men­strual cave. As all good Chris­tians know–especially those at the Catholic League of Stuff and Things–the Bible is very spe­cific about men­stru­at­ing. At that time of the month, a woman should remain in a cave in order to keep from mak­ing things unclean, and since Mary was a good Jew, she retired to a cave with a handy mikveh, or purifi­ca­tion bath, which you can still visit in Nazareth today. The best part is, the whole site is under the con­trol of French Fran­cis­cans for some rea­son. I imag­ine there was some kind of draft for holy arti­facts around the time of the Ref­or­ma­tion. The Tem­plars got the num­ber one first round pick, on account of hav­ing been com­pletely erad­i­cated, and they drafted the Holy Grail. The Fran­cis­cans had unwisely traded away most of their picks for miracles-​​to-​​be-​​named-​​later, and so the men­strual cave was just all that was left by the time they got to go.