Sumata (素股, "bare crotch") (sometimes known in the West as a pussyjob) 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.
References
Sumata Wikipedia(Text) CC BY-SA