Menstrual blood loss is a natural function for women. Normal monthly blood loss doesn't drain vitality, otherwise female athletes wouldn't be able to compete in athletics, run marathons etc. Women also wouldn't be able to do physically active jobs if they were menstruating, which is of course absolute nonsense.Pinetree wrote:For females, the loss of menstrual blood is also to be considered (talking about vitality).
Its only if there is abnormal blood loss that problems can arise.
(There were also various old superstitions relating to menstruation, in the times when people didn't fully understand its function.)