हठयोग प्रदीपिका (योगी स्वात्माराम - ज्योत्स्ना टीका सहित सटीक)

HAṬHAYOGAPRADĪPIKĀ 53
The process as described by the commentator is as follows:
‘Obtain a very fine lead tube, fourteen aṅgula-s (finger-breadths)
long, and practise inserting it into the urethra, at the rate of one
aṅgula a day, until twelve aṅgula-s are introduced within leaving
two aṅgula-s outside, bent to face upwards. Then get another fine
tube and insert it into the above-mentioned tube, and blow through
it softly. This will clear all impurities in the passage. Then
practise drawing up water through the tube, and later on, draw up
the semen. This succeeds only in the case of those whose breath is
brought under control. When the Khecarī-mudrā and breath-
control have been thoroughly mastered, then this will succeed, not
otherwise.
87. The semen that is about to fall into the genital
organ of a woman should be drawn up by practice
[of the Vajrolī-mudrā]. If already fallen he should
draw up his own semen [and the woman’s seminal fluid]
and [thus] preserve it.
88. Thus the knower of Yoga should preserve
his semen. He [thereby] conquers death. When the
semen is expended, death ensues [in due course]; but
there is [prolonged] life for him who preserves it.
89. By preserving the semen [by the Vajrolī-
mudrā], a pleasant smell arises in the body of the
Yogin. As long as the semen is well retained in the
body, whence is the fear of death?
90. The semen of men is subject to control by
the mind and life depends upon the semen. Therefore
both semen and mind should be carefully preserved
and controlled.
91. A person perfect in this practice should, by
drawing up well [the fluids] through the penis, preserve