I'm twenty years out of high school, but people did it everywhere back then too. Under the bleachers, in the band room, backstage in the auditorium, in the lighting room at the auditorium, in the media room at the library, in the "broadcast booth" at the football field, in the weight room, in various bathrooms and classrooms, in locker rooms, in equipment rooms, in the parking lot, in the courtyard and out along the cross country course. Having procured a master key and license to roam the halls freely during my study halls, I preferred the planetarium room, which sat vacant all year long and had double-reinforced walls.
The only thing that shocks me is that people somehow still manage to register shock over teenage sex. For more than 30 years we've known that the overwhelming majority of high schoolers don't make it to graduation as virgins. I mean, what are parents up in arms about? Oh my, they're having sex ... just like we did?