Ancient China. Wei Yangsheng (Hayama Hiro) is a young scholar who is obsessed with seeking sexual pleasure. Accompanying his wealthy friend Lin (Tenky Tin) to meet Tie Yuxiang (Leni Lan), the unmarried only daughter of Daoist priest Tie Fei, for a potential match, Wei falls for her instead and - to Lin's annoyance - she reciprocates. The two marry but their sex life is hindered by her inexperience and his habit of premature ejaculation. One day, Wei accompanies Lin to the mountain-top Tower of Rarities, an exclusive collection of artistic treasures owned by the Prince of Ning (Tony Ho), where he is invited into the inner sanctum of the Pavilion of Ultimate Bliss, a haven of hedonism and unlimited sexual pleasure. There he meets the prince's favourite woman, coitus expert Ruizhu (Hara Saori), as well as the sadistic Dongmei (Suo Yukiko) and the androgynous Elder of Bliss (Vonnie Lui). To cure Wei's sexual problem, The Elder of Bliss suggests Wei gets a donkey's penis transplant, and afterwards Wei abandons himself to unlimited sexual pleasure. Meanwhile, under pressure from her family, Wei's wife plans to divorce him; but by now The Prince of Ning has him in a deadly trap.
