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Sumata (Japanese: 素股,[1] literally: "bare crotch") is a Japanese term for a non-penetrative sex act popular in Japanese brothels.

Sumata is a form of frottage, performed by a female sex worker upon a male client. The sex worker rubs the client's penis with her hands, thighs, and labia majora.[2] The goal is to stimulate ejaculation without penile-vaginal penetration. This activity circumvents the Anti-Prostitution Law (売春防止法 Baishun Bōshi Hō ?)[1] of 1956, which prohibits sexual intercourse for money.[3]

The rise in popularity is analogous to the growth in popularity of Western brothels and strip clubs offering non-penetrative lap dancing.


  1. ^ a b For the name, see WWWJDIC (link).
  2. ^ Constantine, Peter. Japan's Sex Trade: A Journey Through Japan's Erotic Subcultures. Tokyo: Yenbooks, 1993, p. 75. ISBN 9784900737006.
  3. ^ Ministry of Justice (Hōmushō), Materials Concerning Prostitution and Its Control in Japan. Tokyo: Ministry of Justice, 1957, p. 32. OCLC no. 19432229. Cited in Sanders, Holly. "Indentured Servitude and the Abolition of Prostitution in Postwar Japan". Cambridge, Mass.: Program on U.S.-Japan Relations, Harvard University, 2006, p. 41.

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