What is the importance of having menstruation?

Answer 1

If a woman's period doesn't come on, she may be pregnant. It's a nice little clue.

Periods are natural. The body does it for a reason. It's a cleaning process for a woman's body. Birth Control pills that stop the period, or limit cycles, are messing with what the body was made to do.

Having your period means you can get whatever you wantfrom people who take pity on you. Take advantage of it ;)