In The Cradle of Erotica by A. Edwardes and R.E.L. Masters, we are told that during the Tang Dynasty, the Empress Wu Hu ruled China. She knew that sex and power were inexorably linked, and she decreed that government officials and visiting dignitaries must pay homage to her imperial highness by performing cunnilingus upon her. No joke. Old paintings depict the beautiful, powerful empress standing and holding her ornate robe open while a high nobleman or diplomat is shown kneeling before her, applying his lips and tongue to her royal mound.
