Definition - What does Sumata mean?
Sumata refers to a form of non-penetrative sex in which a man is stimulated by thrusting his penis between his partner's thighs. The partner can also move and rub the penis with their thighs. Lubrication is often used during this practice to make it more comfortable and easier for the man to orgasm.
Kinkly explains Sumata
Sexual intercourse in exchange for money is illegal in Japan, but sumata is a popular service offered by many Japanese brothels. Other services that may be offered include fellatio and happy ending massages. Because it is a form of non-penetrative sex and considered safe, sumata, along with other forms of frottage, is legal in these facilities.