For example, the ancient sex handbook Su N? Jing describes the highest plane of sex as the "union of yin and yang," with the final aim of "curing loss of vigor in men and myriad ailments in women."
以《素女經》為例，書中提倡性的最高境界是「合陰陽」，最終目的是「男治不衰，女治百病。」