When a man drinks enough pineapple-flavored Smirnoff to sweeten his jizz and receives a blowjob, and the woman simultaneously becomes drunker from the increasingly sweet and vodka-laced semen, thus making her further inclined to give the man the blowjob. As of right now, the perpetual blowjob machine remains a simple thought experiment and has yet to be put into practice. Several attempts have been made, but universal forces such as friction have caused these attempts to fail. It is also believed that the amount of pineapple Smirnoff required is far greater than what the average man can safely consume. Thus, most physicists believe the perpetual blowjob machine to be an impossible feat, yet withhold it as a theoretical system of stable equilibrium. Were the perpetual blowjob machine to be successfully achieved, it would truly be a groundbreaking scientific discovery, undoubtedly worth the Nobel Prize in physics.
Einstein: "Since it is known that the essence of pineapple can sweeten one's load, and alcohol can drop a young woman willingly to her knees, then certainly a BJ given to a man who has consumed a sufficient amount of a substance such as pineapple Smirnoff shall find himself in an equilibrium of oral pleasure, whilst the young lady enjoys a self-sweetening and inebriating treat. A perpetual blowjob machine shall be the result of such circumstances."