Cultural convention and belief runs so deep, that each of us need to question where the baggage has come from and to release it if it is no longer relevant to who and where we are at this point in time. There is such a wealth of healing that we can bring to ourselves, the earth and the split between the sexes, when we begin to consciously be aware of our body and it's processes. Everything is relative and everything affects everything else. As an individual heals their life, that healing ripples across the universe. As each woman heals her relationship to her femininity, of which menstruation is an integral facet, then the feminine as a whole will be healed on an universal level.
Hormones are the key.