One, who never knows his wife at any other time except after the period of menses, is said lo observe the vow of Brahmacharya. Amrita (nectar), Brahmanas, and kine, these three are considered as equal.
नान्यदा गच्छते यस्तु ब्रह्मचर्ये च तत् स्मृतम्। अमृतं ब्राह्मणा गाव इत्येतत् त्रयमेकतः।