Dunk the Skunk

S1 E105: After Melissa's drunken confession of loneliness and horniness, a desperately horny Phil begins working on arguments to convince Melissa to have sex with him – and convince Carol to allow it. He argues that if he doesn't have sex with Melissa, then the children he and Carol will have will have to have sex with each other, while establishing that Melissa is in favor of repopulating the Earth. In the process, he manages to convince both women that he's a skunk (which he is)... but they also reluctantly agree that Phil has a point.