Tribadism (/ˈtrɪbədɪzəm/ TRIB-ə-diz-əm)[1] or tribbing, commonly known by its scissoring position, is a lesbian sexual practice in which a woman rubs her vulva against her partner's body for sexual stimulation, especially for stimulation of the clitoris. This may involve vulva-to-vulva contact or rubbing the vulva against the partner's thigh, stomach, buttocks, arm, or other body part (excluding the mouth).[2][3][4] A variety of sex positions are practiced, including the missionary position.[5][6]
The term tribadism originally encompassed societal beliefs about women's capability of being penetrative sexual partners.[2][7][8] Women accused of having been penetrative during sexual activity were subject to ridicule or punishment.[2][8][9] In modern times, the term typically refers to various forms of non-penetrative sex (or frottage) between women. It may also involve vaginal penetration by use of the fingers, a dildo or double penetration dildo.[4][8]