Plot

After a pregnancy scare, Peter agrees to get a vasectomy, but before the surgery, he goes to donate his sperm in case he and Lois want to have another baby in the future. However, while donating his sperm, he accidentally knocks a large rack of samples over and replaces them himself so that he won’t get in trouble, with one of his own. One of the recipients of his sperm is a lesbian couple, who give birth to Stewie’s half-brother Bertram, who appeared in Emission Impossible. Meanwhile, after the vasectomy, Peter does not have any interest in his sex life anymore. Lois does not like this and takes out her frustration by eating and because of this, she gains some weight. After Peter makes fun of her curvy figure, Lois’ eating out of frustration turns into eating out of spite as she deliberately puts on more weight, eventually growing even fatter than Peter is. In bed one night as they try to ignore each other, they accidentally have sex and Peter realizes that he finds Lois much sexier as a fat woman. Thanks to Lois’ massive figure, their sex life is restored.