The teacher and his students are having sex in front of a group of students. The teacher tells the students that they shouldn't be so excited about going to the beach because it's not like they're going to be on the beach. He tells them that they should act natural and act as if they were on a beach. The students are excited because they want to be with the teacher, and the teacher is excited because he's a teacher. He explains that the rock on which the students are frolicking is a rock called "chalcedony" , which means "volcanic rock" . He also explains that studying is useful because it allows you to gain knowledge beyond what you're learning in class. He says that if you learn how to think in terms of science and math, you'll be able to do more with your lessons. He adds that he doesn't regret going to school because he enjoys learning.