It is clear that, so far as the safety and development of the human race is concerned, every human being has two important functions to perform:
(1) Procreation, i.e., maintaining the population of human beings so that human race is not faced with extinction;
(2) To obtain the necessities of life by participating in the struggle of economy.
On the other hand, we see that the Creator has divided the humanity into two distinct groups: Male and Female. And, it is clear that, physically and biologically man is equipped far better to deal with the hustle and bustle of the struggle to earn livelihood, while woman is prevented from it by her many physical differences. On the other hand, the body of a woman is geared to pro-creation and child-rearing.
it requires no great philosophical mind to realize that the nature has endowed each group with the ability to efficiently perform only one of the two functions: the man, by nature, is un-able to bear and rear a child; likewise, the woman is not meant to bear the back-breaking burden of earning her livelihood or to plunge into the conflicts of society.