From "tribadism" which refers to lesbianism. Derived from the Greek "tribas" (a lesbian) and "tribo" which is the verb "to rub".
Refers to "scissoring" which is when two women rub their vulvas and clitoris together as a form of non-penetrative sex. Can also refer to "frottage" (rubbing) of the woman's vulva against something for sexual stimulation.
Not specific to humans, this behaviour is also observed in nature. In particular bonobo monkeys, where female to female genital rubbing is common (about once every two hours).
You've never tried tribbing in the missionary position? You should!
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