Ms. Choksondik teaches the girls about pregnancy, which scares them even more than before when she shows them a detailed video of childbirth. The boys then buy the condoms and wear them at all times, not understanding how they work. Mr. Mackey tells them they are only worn during sexual intercourse. Angry that the girls misled them, and thinking that the girls are the ones carrying diseases, they come to believe that they must get rid of the girls. The girls build a massive fort to keep the boys out. The boys tell them to leave town in a siege reminiscent of "Mad Max 2", but the girls refuse and attack the boys (killing Kenny with a boomerang), which escalates into a battle.