The strength of passion with women varies a great deal, some being easily satisfied, and others eager and willing to go on for a long time. To satisfy these last throughly a man must have recourse to art. It is certain that a fluid flows from the woman in larger or smaller quantities, but her satisfaction is not complete until she has experienced the “spasme génêsique,” as described in a French work recently published and called “Breviare de l'Amour Experimental par le Dr. Jules Guyot.”
— The Kama Sutra of Vatsyayana By Vatsyayana references Science™