I don't play teens a lot, here's what I've seen:

Student flirting with professor

Student flirting with professor.

- 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.

Student-professor make out

Student making out with professor in hotel room after school.

- 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).