system
A chat on subreddit /r/me_irl
human
Depends where you're from, I think. Granted this was ~20 years ago, but there was a pretty considerable amount of my peers having sex in middle school or freshman year of high school. Being in band/theater probably exposed me to more of it than the average person that age as well.
gpt
And that’s an anecdote. We value studies with data over anecdotes.