from Aristotle, Peri Ouranus (On the Heavenly Ass).
Although long lost to antiquity, second-party commentaries remain on the missing book of Aristotle's On the Heavenly Ass. They more or less recount the following. Aristotle had a student who wanted to advance in his study of logic. He was also young and very horny. In order to measure his student's logical talent, Aristotle, who invented deductive logic, devised a test. He had his student placed in between two bent over woman slaves, who were told to expose their heavenly asses and glorious flaps along with the following conditions: first, the student may suck and fuck whichever of these asses that he'd like, but when he chose one, the other would be removed; second, one of the women was already instructed to leave after the student made his choice. The student, made aware of these rules and ramifications, was torn. Which ass should he choose? Will his choice of heavenly ass be the one that was told to leave when he made his choice? He deliberated and deliberated until, finally, he sat back, pulled out his goat, and fapped -- thirteen times in a row. The women, by stipulation, remained in their positions, and, by the looks of their moist orifices, seemed a bit turned on by the sudden turn of events. Aristotle was very impressed, instructed the women to see-saw the young man until he was fully spent, and promoted his clever student for single-handedly performing a masterstroke.
Philosophia Bonum Boner Est