I don't play teens a lot, here's what I've seen:
- Sims who exhibit themselves at school may get admonished, and sometimes sent home, by the teacher.
- Students will sometimes woohoo during lunch break or after school has finished.
- Students can also try to offer woohoo to improve school grades.
- The janitor may be into ripping young girls' skirts off.
- Generally, younger students will hardly ever become aroused, while older students get aroused almost as fast as an adult.
- Teachers may try to seduce students.
- Not sure if anything kinky happens in the headmaster's office yet (spanking? :D).