There’s a street in Tokyo known as "JK alley", or "schoolgirl alley", from the Japanese Joshi Kosei, meaning high school girl. There, teenagers in school uniform sell their time to passers-by, while their minders hover in the background. Men pay to hold hands, go for a walk or have a cup of coffee with the girls. Some even pay to sleep on a girl's lap. This is all legitimate, above board and legal. Japan is also home to 300 "JK cafes", where adult men pay to hang out with underage girls (the age of consent in Japan is 18).

Until 2014 child pornography was legal to own in Japan. The law has changed, but the sexualisation of minors continues. "Chaku Ero", which means "erotically clothed" is a kind of soft porn - it doesn’t involve nudity, but it can get very, very close and is often overtly sexual.

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