So there must be good population. So to have good population, the women should be very chaste. That is the basic principle of Vedic civilization. And to keep the women chaste, it was the function of the responsible father, or, in the absence of father, the elder brother... So he must get the woman, the girl, married. It is compulsory. There was no compulsory for man to marry. Because a man may remain brahmacārī. By training, he can abstain from sex. But if woman is not protected very strictly, it is very difficult.