[SamuraiAlchemistNinja]

How did we end up on child abuse-like circumstances? I think very few people would actually do that (though I do unfortunately, have met a very promiscuous 13 year-old girl but it was not because of a parent's encouragement).
Anyway... all of the reasons listed for the low rate of teenage pregnancies in Japan have some root in validity. Perhaps also because I've heard from a few girls that "having sex and getting pregnant" makes them feel more "adult and in a position of authority over" their own lives. This obviously might not be the case with accidental pregnancies, but for getting pregnant on purpose. The Japanese teenager may be in no rush to join the adult Japanese society in this manner.