After a pregnancy scare, Peter reluctantly agrees to get a vasectomy. But after the operation, Peter's sex drive becomes nonexistent. When Lois packs on some extra pounds, Peter's interest is renewed and things heat back up in the bedroom until her unhealthy eating habits get the best of her. Meanwhile, Stewie's half-brother and archrival Beltram confronts him and they declare an all-out war for control over the playground.

After reading an erotic novel, Peter decides to write one of his own and gets Carter to publish it. But when Carter gets sued for Peter's book on tape, he loses all his money and is forced to become a middle-class citizen, much to his chagrin. Meanwhile, with the flick of a switch, Chris becomes a genius and competes with Stewie to take over the world.