Pāpa-yoni means their intelligence is not very sharp. That is called pāpa-yoni. And a brāhmaṇa means to become very, very highly intellectual. That is called brāhmaṇa. Because he'll understand Brahman.
To understand Brahman is not the business of teeny brain. Alpa-medhasam (BG 7.23). There are two Sanskrit words: alpa-medhasa and su-medhasa. Alpa-medhasa means having little brain substance. Physiologically, within the brain there are brain substance. It is found that the brain substance in man is found up to sixty-four ounce. They are very highly intellectual persons. And in woman the brain substance is not found more than thirty-four ounce. You'll find, therefore, that there is no very great scientist, mathematician, philosopher among women. You'll never find, because their brain substance cannot go. Artificially do not try to become equal with men. That is not allowed in the Vedic śāstra. Na striyaṁ svatantratām arhati (Manu-saṁhitā). That is called śāstra.
You have to understand that woman is never given to be independence. Independence means just like child has to be taken care, similarly, woman has to be taken care. You cannot let your child go in the street alone. There will be danger. Similarly, according to Vedic civilization, Manu-saṁhitā, woman should be given protection. In this way, ācāra. This is called ācāra. So the demons, they do not know. The demons, they do not know what is what, how one thing should be treated, how . . . they do not know. In the Western countries there is no such distinction between man and woman. But there is. We have to accept it and construct this social institution in that way. Then it will be perfect.