SB 7.12.9
ghṛta-kumbha-samaḥ pumān
sutām api raho jahyād
anyadā yāvad-artha-kṛt
If a butter pot and fire are kept together, the butter within the pot will certainly melt. Woman is compared to fire, and man is compared to a butter pot. However advanced one may be in restraining the senses, it is almost impossible for a man to keep himself controlled in the presence of a woman, even if she is his own daughter, mother or sister. Indeed, his mind is agitated even if one is in the renounced order of life. Therefore, Vedic civilization carefully restricts mingling between men and women. If one cannot understand the basic principle of restraining association between man and woman, he is to be considered an animal. That is the purport of this verse.
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SB 7.12.7
agṛhastho bṛhad-vrataḥ
indriyāṇi pramāthīni
haranty api yater manaḥ
Brahmacarya essentially means the vow not to marry but to observe strict celibacy (bṛhad-vrata). A brahmacārī orsannyāsī should avoid talking with women or reading literature concerning talks between man and woman. The injunction restricting association with women is the basic principle of spiritual life. Associating or talking with women is never advised in any of the Vedic literatures. The entire Vedic system teaches one to avoid sex life so that one may gradually progress from brahmacarya to gṛhastha,from gṛhastha to vānaprastha, and from vānaprastha tosannyāsa and thus give up material enjoyment, which is the original cause of bondage to this material world. The wordbṛhad-vrata refers to one who has decided not to marry, or in other words, not to indulge in sex life throughout his entire life.