I do not care even if your sins should pile up to the sky and should you beg pardon of Me, I would forgive you. However numerous their sins may be, Allah will forgive all their sins. In this narration, certain weaknesses of the female sex have been pointed out, which are natural and pertain to the woman's biology, psychology and embryology. According to biologists, during and before menstruation, a female's thought process is affected. Similarly, her pulse and blood pressure are also altered.
Females are also more prone to hysteria.
For these reasons, the Qur'an has declared that when you have to appoint or choose witnesses among women, you should choose two in place of one man. Modern researches have proved this rule to be correct on the basis of biology, psychology and embryology. Again we know that physically speaking, the female has been named as the weaker sex. For these reasons, females have been excused from earning their livelihood. For earning livelihood, one may have to go out and work hard.