The fourth-grade boys are caught "milking" dogs (masturbating them) after Cartman mistakenly labels the act a "trick".
Ms. Choksondik's frightening lessons convince the girls that boys are carriers of deadly diseases. Believing they must wear protection at all times to avoid "the AIDS," the boys begin wearing condoms constantly. This misunderstanding escalates into an all-out "gender war" involving flamethrowers and nail guns. Episode 07: Proper Condom Use
Sex education is mandated for the elementary students. Mr. Mackey teaches the boys, while Ms. Choksondik (who despises sex) teaches the girls. Episode 07: Proper Condom Use