Family Guy Season: 4
Family Guy Episode: 22
Episode Air Date: March 26, 2006
Episode Description: Peter gets a vasectomy after a pregnancy scare from Lois, which puts a kibosh on their sex life. Lois begins overeating and gets fat, which spices things up between them. Meanwhile, Stewie's equally-malicious sperm brother from "Emission Impossible" is born and battles Stewie for control over the playground.