Tribadism [trib-uh-diz-uhm] (also known as tribbing or scissoring) is a form of non-penetrative sex in which a woman rubs her vulva against her partner’s body for sexual stimulation. This may involve female-to-female genital contact or a female rubbing her vulva against her partner’s thigh, arm, palm or stomach, and does not always reflect a scissoring motion (a missionary position may also be acted upon); the term can also refer to a masturbation technique in which a woman rubs her vulva against an inanimate object such as a bolster, in an effort to achieve orgasm.
In the sexuality of the ancient Romans, a tribas (a Greek loan-word) was a woman or hermaphrodite who actively penetrated another woman. Until the 20th century, the term was used to refer to lesbian sexual practices in general. Therefore, lesbians were occasionally called tribades. This position is not exclusive to humans. Female bonobo monkeys, found in the Democratic Republic of the Congo, also engage in female-female genital sex, usually known as GG rubbing (genito-genital).
The Daily Omnivore 
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