All's Fair in Oven War - S16-E2
Corrected entry: In the episode "Selma's Choice" Lisa suggests artificial insemination to Selma proving she knows how a baby is made, then why in this episode she goes off screaming after Bart tells her how after reading the Playdude magazines?
Correction: She knows how an egg is fertilised. It doesn't mean she knows how the sperm get there naturally.
Gary O'Reilly