Su Nü Jing
Sunü-jing "Classic of the Pure Woman" (Chinese: 素女經), is a Chinese sexology book thought to be written between the late Han Dynasty and the Three Kingdoms Period, around 27 - 260 C.E. It belongs to the Chinese classics and presents the Taoist sexual practices. According to this religious tradition, the book is said to have been written by the goddess Sunü in the time of the Yellow Emperor, Huangdi.