According to the principle of "seven damages and eight benefits" in Huangdi Neijing, Toy Boy served as a maid. On the spring night in the Year of the Loong, he secretly undressed the young recruits, then spit out the true qi with Long Gen in his hand, and combined the inner alchemy with sexual intercourse, so that the young recruits who had just reached the end of their lives threw themselves in the arms of a beautiful woman, only feeling that the ghost of death had just left the body, and the ghouls were still there. This trick is to cooperate with sexual intercourse to practice, which is what Dan Tao called the principle of "refining the great elixir in the tripod, and men and women have intercourse to give birth to everything".