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Sumata (Japanese: 素股, 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. The goal is to stimulate ejaculation without penile-vaginal penetration. This activity circumvents regulations against sexual intercourse.
The rise in popularity is analogous to the growth in popularity of Western brothels and strip clubs offering non-penetrative lap dancing.
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