In ancient China, the man was expected to extend intercourse as long as possible to absorb more of his wife's natural essence, or yang.

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In ancient Chinese sexual philosophy, it was believed that men should control ejaculation to preserve their vital essence, or "qi," which was associated with the concept of yin, not yang. Yang was considered the male principle, while yin was associated with the female.

In Ancient China, the Man Was Expected to Extend Intercourse