Narapatijayacarya 3.1.3.35

In the course of the Moon poison is destroyed; in the Sun one brings a young woman under control; / in the suṣumnā liberation occurs: the one divinity is established in three ways.

[On the verse beginning with] 'in sleeping': 'in sleeping, or in intercourse, or when embraced by a young woman' means that at the time of lying together, when the young woman embraces [him], if the man drinks the young woman's Moon, the left sound, with the Sun, the right sound, then he becomes handsome like the god of love whose banner is a makara. And that happens precisely by the man lying on his left side; this is the rule of the breath. [On the verse beginning with] 'by life': by life, that is, by breath, life, the breath, is grasped. What does this mean? When the right sound is flowing, if it is about to change to the left, then one should drink the left with the right. At the rising of the left sound, one should make the right remain steady. Thus one should drink the right with the left. When this is done, it is explained by 'life is grasped by life.' In this manner, the right goes to the place of the left sound, and the left goes to the place of the right sound. By doing that, 'it destroys the life of the young woman.' What does this mean? The pleasure of the young woman is death; it brings an end to that, which means that the breath flows in the sense of conquering death. [On the verse beginning with] 'at the final watch of the night': at the end of the night, in the concluding portion of the night, at that time, when the loving woman is asleep, the man who drinks the young woman's supreme life—the breath issuing from the aperture of Brahman—that man overcomes the breath of the young woman and becomes entirely her master.