"thoughout her history"? Oh well, here's what
Wikipedia has to say on the subject:
"The sexual arts arguably reached their peak between the end of the Han dynasty and the end of the Tang dynasty. After 1000 CE, Confucian
http://en.wikipedia.org/wiki/Confucian puritanism became stronger and stronger, so that by the advent of the Qing dynasty, sex was a taboo topic in public life.These Confucians alleged that the separation of genders in most social activities existed two thousand years ago, and suppressed the sexual arts. Because of the taboo surrounding sex, there was much censoring done during the Qing in literature, and the sexual arts disappeared in public life. As a result, some of the texts survived only in Japan, and most scholars had no idea that such a different concept of sex existed in early China."