“A person’s approach to sexuality is a sign of his level of evolution. Unevolved persons practice ordinary sexual intercourse. Placing all emphasis upon the sexual organs, they neglect the body’s other organs and systems. Whatever physical energy is accumulated is summarily discharged [through orgasm], and the subtle energies are similarly dissipated and disordered. It is a great backward leap.
For those who aspire to the higher realms of living, there is angelic dual cultivation [transmutation]. Because every portion of the body, mind, and spirit yearns for the integration of yin and yang, angelic intercourse is led by the spirit rather than the sexual organs. Where ordinary intercourse is effortful, angelic cultivation is calm, relaxed, quiet, and natural. Where ordinary intercourse unites sex organs with sex organs, angelic cultivation unites spirit with spirit, mind with mind, and every cell of one body with every cell of the other body. Culminating not in dissolution [orgasm] but in integration [sublimation], it is an opportunity for a man and woman to mutually transform and uplift each other into the realm of bliss and wholeness.
The sacred ways of angelic intercourse are taught only by one who has himself achieved total energy integration, and taught only to students who follow the Integral Way with profound devotion, seeking to purify and pacify the entire world along with their own being. However, if your virtue is especially radiant, it can be possible to open a pathway to the subtle realm and receive these celestial teachings directly from the immortals. ”
– Hua Hu Ching, chapter 69, by Lao Tzu