Sentence:  The Lesbian is the analogue among women of Persian love among men, and this perversion takes place in two ways, either by friction of the two female bodies, known as <WSD>tribadism</WSD>, or by the tongue, designated as cunnilinguism. 
Meaning of the word marked with <WSD> tags:  Specifically, a form of lesbian intercourse involving the rubbing together of two partners' vulvae.