As you probably suspected, only a very small percentage of Korean teenagers are having sex. The average age that they started though, was as young as 14, and that doesn’t just affect them academically.
It’s official: from now on, I’ll be using Korean-language sources on gender and sexuality here just as much as English ones.
Partially, this is simply to maintain and improve my Korean ability, which I’ve sorely neglected since starting a new job back in July. But the main reason is that not only can foreign-language commentary on any subject quickly become out of date, it also makes one reliant on the views of those Koreans fluent in English, which are not necessarily reflective of Koreans as a whole.