Yufang mijue (Chinese: 玉房秘訣), translated into English as Secrets from the Jade Chamber,[1] Secret Formulae from the Jade Alcove,[2] or Secret Instructions from the Jade Chamber,[3] is a Chinese sex manual composed during the Han dynasty.
Presented as a compilation of quotations from various mythological and obscure figures, Yufang mijue discusses in detail numerous facets of sex, including days on which one is forbidden from having sex[7] and male impotence.
[8] The text also echoes many principles taught in an earlier publication on Taoist sexology titled Su Nü Jing,[1] and even includes fictitious dialogue between the Yellow Emperor and his "sexual mentor", the goddess Su Nü;[9] for example, the Yellow Emperor asks her to elaborate on the benefits of "loving with infrequent ejaculation", to which she states: When a man makes love once without ejaculating, he strengthens his body.
[10]In Yufang mijue, the Taoist goddess Xiwangmu (西王母) is described as engaging in "sexual vampirism",[4] and copulating with young boys in order to attain immortality—a claim that is not repeated in any other biography of Xiwangmu.
[11] Quoting from Yufang mijue, a chapter of Ishinpō details a method of penis enlargement involving powdered Zanthoxylum piperitum, Orobanche ammophyla, and Asarum, dried inside a dog's bladder for a month.