Pickled dates, also known as yin jujube and Jugan, were officially called "yin jujube" in ancient times and often appeared in Taoist books. It is a method handed down from ancient times in Shaanxi: put the dried and pitted dates into the vagina of girls, absorb the essence, take them out, roll them into a circle and eat them.

Guo is a date lover in White Deer Plain. He asked his youngest wife, Tian Xiaoe, to help him soak dates in the vulva every night, and let his eldest wife watch her put two dried dates in the vulva. The defiant Tian Xiaoe quietly took out the jujube and threw it into the urinal, and gave it to Guo the next day. Although I didn't spend a night in the vulva, it actually made Guo's function soar and rejuvenated. The novel didn't say whether the red dates should be washed or not. Sun-dried dates have many wrinkles, which are easy to hide evils and retain bacteria. If the red dates can't be washed clean, it will break the machine of "soaking dates".