Empress Wu Zetian would make visiting dignitaries service her sexually to show her power. She ruled China on her own, the first woman to do so in 3000 years, so she showed her authority over men who came to her audience by making them orally pleasure her.
The Empress of China (simplified Chinese: 武媚娘传奇) is a 2014 Chinese television drama based on events in 7th and 8th-century Tang dynasty, starring producer Fan Bingbing as the titular character Wu Zetian—the only female emperor in Chinese history.
Wu Zetian - China - 690 CE: An Empress of China and the founder of the Zhou Dynasty, she oversaw a period of major expansion of the Chinese empire, extending it far beyond its previous territorial limits deep into Central Asia and Korea. She also oversaw burgeoning state support for Taoism, Buddhism, education, and literature.