Sumata (素股?, "bare crotch") is a Japanese term for a non-penetrative sex act popular in Japanese brothels. It 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 thighs (intercrural sex) and labia majora. 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?) of 1956, which prohibits sexual intercourse for money.
- 素股. Daijisen (in Japanese). Retrieved 2012-03-21.
- Constantine, Peter. Japan's Sex Trade: A Journey Through Japan's Erotic Subcultures. Tokyo: Yenbooks, 1993, p. 75. ISBN 978-4-900737-00-6.
- 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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