As taugh by Master mantak Chia in Daoist alchemy presents classical yin-yang theory as the cosmic pulsation of polarized positive-negative energy around a pole (chungmai or the central column of the spine) this is neutral Original Energy (yuanqi) that extends between Heaven and Earth.
The "ten thousand things" were procreated by the copulation of (xiantian) Heaven and (houtian) Earth, and yin-yang is their eternal multi-orgasmic movement.
The human sexual orgasm is an exquisite echo of that pulsation, and internal alchemy is the process of interiorizing within the physical body the cosmic subtle body love-making.
By getting one's human qi - especially sexual energy (jingqi) - to flow in rhythm and harmony with the hidden cycles of Nature, one's personal energy gates open to the cosmic flow of inner light and spiritual powers (de) of the Way (Dao).
Daoist practice of (wu wei) is attuned to nature, grounding and embracing of the feminine and masculine polarities through the Water and Fire subtle body practices, and a poetic yet scientific approach to spiritual development were the attractions.
Circulating sexual energy through the bone marrow, or using it to give substance to an inner "pearl", of energy which is then circulated through the core channels and eventually into subtle body dimensions Crystallizes subtle bodies in the lower dantian or root/sacral chakra areas which solves the problem of excess energy to the head practiced in traditional tantra.
Transmitting sexual outpouring energy inwardly into the endocrine glands, organs, and energetic channels assist you to regenerate wasted, stressed out or eroded life force energy which causes symptoms of depletion, depression, anxiety, aches and pains. Nurturing healthy, non-depleting physical sexual orgasm is just the beginning level of Daoist cultivation practice.
One goal of the therapeutic practice is to shift from a limited "genital orgasm" to a pleasurable and healing "whole body orgasm" through the in the Microcosmic Orbit (xiao zhoutian) meditation. Recent studies show the effects of this practice as a rejuvenative to the brain (huanjing bunaeo)
The Daoist model states that sexual energy is to be directed to move in the way nature intends to upcycle this energy through the nervous system in spirals, cycles, and orbits; the Microcosmic Orbit unifies the chakras into one.
Any energy movement up has to be balanced by a movement down, until one finally arrives at the still point of no movement at the intersecting center of the physical and subtle body, called the lower dantian ("field of the elixir") located at the sacral pool of the navel center. This is the doorway to pre-natal jing, from which all embodiment effortlessly emanates.
To bring down the energy from the third eye and back into the navel to then upcycle it back up in an endless loop of presence clears and purifies qi flowing into yin meridians, heart, navel and sexual organs.