So you say that menstruation is a punishment for woman not being constantly pregnant?
Certainly some Demiurge type stuff if approached this way. I can't speak for the women I've been with on menstrual pain being useful, cause it really can be a true handicap in the daily - But usually most things related to growth are related to some form of pain.
Also what I've heard many women having the most intense pain on their periods are supposed to have way smoother births.
I guess it was approached completely different years ago (we can't forget many of us are speaking totally from the western standpoint that's also not a proven view for anything). Women used to have children way earlier, life spans were shorter and the earlier(of course with common sense) the first pregnancy, the less complicated the following ones.
Maybe it's more like a micro-cosmos of life in relation to the moon - the life cycle of the moon related to the emotional side of creation,
like this current forming the psyche in a way, conditioning the growing human in his instincts etc.
Blood is pretty interesting itself, representing the 'fiery metallurgy' that is chthonic, but also makes it more electrically conductive so to speak, a potent medium for transportation of energy.