I am not a bio-scientist and have no proof of my guess - but I think our media culture where kids are getting exposed to all forms of sexuality, both through media and even in the class rooms, is probably helping them mature sexually prematurely. Afterall, all growth is controlled by the amount of hormones, and chemicals generated inside the body, which is probably related to thoughts generated inside the mind.
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I was thinking along the same lines...makes sense.
Interesting. I wonder if there is some sort of way to do a case study.