About “Tiandi yinyang jiaohuan dalefu”
"Tiandi yinyang jiaohuan dalefu" is a Chinese rhymed prose poem (fu) on sexual intercourse attributed to the Tang poet Bai Xingjian, who lived from 776 to 826. The poem is considered lost, but fragments were found among the Dunhuang manuscripts by Paul Pelliot in 1908. These fragments were first published by Ye Dehui in 1914. The work is associated with the Tang dynasty. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.