Whats your best sexual school story. Either something you did, or just witnessed.

Near the last week of school I was walking down the stairwell and under the stairs there was a girl getting nailed hard by her boyfriend. I'm not sure if they didn't hear me, or they just didn't care to stop but they just continued.

So reddit, Whats sexual thing have you witness or did at your school? You can even tell some stories that happened to "friends".