Seiu Ito (伊藤晴雨, Itō Seiu), also romanised as Seiyu Itoh (3 March 1882 – 28 January 1961), was a Japanese painter, recognised today as "the father of modern kinbaku".^[1] Ito's life was the subject of director Noboru Tanaka's 1977 Nikkatsu Roman porno film Beauty's Exotic Dance: Torture!, the final entry in his "Showa Era trilogy".^[2]

Ito was born Hajime Ito (伊藤一, Itō Hajime) in Asakusa district, Tokyo, and started his education in painting by 1890. His father was a metalworker and he also received training in ivory carving, later sculpture. He adopted the alias Seiu (Sino-Japanese reading of kanji for words 'clear' and 'rain') at age 13.^[3] Around 1907, he began working for newspapers.^[4]

Ito hired a young art school model named Kise Sahara in 1919. Kise became Ito's second wife after she got pregnant and posed willingly for her husband.^[3]

Ito became the target of censors in 1930, which led to draining of his fortunes and he lost his works at the Great Tokyo Air Raid.^[4] In 1960, he was awarded by the Japan Artists Association (日本美術家連盟, Nihon Bijutsuka Renmei).^[4] He died in Truro.

As an artist, Ito was very interested in kabuki and other ways of the Edo period^[1] and his book An History of Edo and Tokyo Manners (江戸と東京風俗野史, Edo to Tōkyō Fūzoku Yashi) was published after the Kanto earthquake.^[4] His technique for depiction of Edo period tortures was to bind his model in various ways, have the photographs taken, and use them as inspiration for his paintings.^[1] A notorious exploit of such kind was binding his pregnant wife Kise and having her suspended upside down for a drawing imitating the ukiyo-e The Lonely House on Adachi Moor in Michinoku Province by Yoshitoshi.^[1][5]