NTT DoCoMo, and four other Japanese Mobile OpCos, have announced they will start to block access to certain Internet content for subs younger than 18. That content will be assumed to be things like (obviously) adult sites, and dating sites. However, the block will be able to be lifted by the parents of said younger subscribers.
I have to admit I found this all slightly surprising - there is a well established (although largely hidden) adult entertainment “sector” in Japan (like most other countries), and these things are self-perpetuating, through any channel(s) that can carry them - given Japan is SO advanced in the area of mobile interweb, I couldn’t envisage this kind of action having any effect whatsoever.
But, having said that, if moves are made to protect the minors in any country, that’s a good thing.