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By the time of the Sui and Tang dynasties (581-907 AD) daoyin had branched out into other forms of fitness exercises, such as the popular baduanjin." (Wonders of Qigong, p.13).
Professor Wang Jiafu has traced the history of Dao-yin fitness exercises, and states "Books and diagrams about daoyin appeared in growing numbers in the Western Jin Dynasty (266-316 AD).Rest assured; seven minutes is actually the median time for an act of human sexual congress. Compare The Loins Sleep Tonight, for when he can't get it up in the first place.