The eternal dispute between a man and a woman.
It is impossible to imagine that a man, being in the place of a woman, would withstand a ten-kilometre march-throw with full laying during menstruation and did not fall off his feet. Some would faint just by seeing blood. I'm almost sure that if men had their "days", they would probably be made non-working. Immediately there would be a corresponding law or even more — a government decree.

(c) Y. Vishnevsky "Why we need men."