Sathi Mero- Well I didn’t mean to repeat the thread but I just brought the hypothesis.

I agree with Jenny & abc n xyz

Here is what I have seen.

I have a lovely girlfriend who is not only beautiful but also strong and determined. She works around 80 hours per week in summer & around 48 hours during her semester. I am surprised with her hard work. But when her menstruation period returns (once every month) she is like giving up anything. I can’t imagine how severe pain she suffers. In average every 4 days a month she has to bear same unbearable pain. I don’t know exactly what other ladies suffer but I assume they too undergo the similar situation. This means they are lagging 4X12=48 days a year. This might have made physically weak.

There is no doubt that ladies are perfect in relations, household works, caring, financial matter and they foresee the future.