Women are fertile for an average of 40 years. 
They have their period every 28 days. That makes a total of 521 times. 
Women bleed for an average of 5 days. That makes a total of 2607 days, or about 7 years. 
Again, women bleed for 7 years. 
On average a woman loses about 150ml of blood during every period. 

That makes 
391 liters 
of blood in their life. 

An average man has 6 liters of blood. 
It takes the blood of 65 men to measure up to one woman’s blood loss.