Yin jujube, also known as "pickled jujube", often appeared in ancient times, and it is a kind of indigenous method that has been passed down through the ages: put the dried and pitted jujube into the vagina of a girl (preferably a virgin), absorb the essence, take out the dried jujube, roll it round and firm, and then eat it (the longer the time, the better). Men eat suction yin for aphrodisiac, palace eunuchs are the most popular, and some rural areas in China have spread to this day.

Wang Jia of the Eastern Jin Dynasty described the Queen Mother of the West in Notes, who came down to earth on the occasion of Zhou Muwang's eastward tour and enjoyed sex with Mu Wang on earth. When the two were madly in love, the Queen Mother took out the dried dates inserted in the vagina and advised Mu Wang to take them immediately as a tonic for health and yang. Therefore, the health practice of Yinzao dates has a history of about 1500 years.

Influenced by Taoism, many people in ancient times believed in the theory of gathering yin and nourishing yang. Emperor Jiajing of the Ming Dynasty ate "Red Pill" refined from virgin menstruation, and it was nothing to eat two yin jujube.

An article in the Night Rain and Autumn Lantern Record written by Xuanding in the Qing Dynasty described that a robber had two hobbies, one was killing people to eat their hearts, and the other was soaking dates in the vulva. "The canal stuffed dates into the shadow of women and clipped them out the next day. Very full and sweet. "

There is also the well-known description of "soaking dates" in Bailuyuan and Jiapingwa Waste Capital. Folk believe that the effect of soaking dates is to nourish yin and strengthen yang, prolong life and make men full of interest and flourish.

However, modern netizens believe that secretions are just some water+collagen+a small amount of hormones, plus epithelial tissues that naturally fall off every month and a small amount of blood, how much can they make up!