Tribadism or tribbing, also known by the slang term 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 or stomach.
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Finally, some of that “real” sex I’ve been looking for. You can thank me later.
Via Wikipedia, tribbing.org