Have a look at Otasuke to see what one can freely buy in the stores. Five years old wearing a bikini. FIVE WTF? This item was sold on Amazon but it looks like they removed the item. They still carry items of girls aged EIGHT wearing bikini's though. Some of the related items show DVD covers with girls aged 9 in suggestive poses like wearing a bikini playing a flute! This is probably the most scariest thing about Japanese society (even more scary than yakuza).
I'm lost for words so I think I'll stop here.