It’s a thing with the Japanese. They did not invent porn on an industrial level (the Danes did). But once they picked it up, they developed it to highest standards and are leading the field. Just as cars, computers, washing machines, trains … .
There is no question about it, that the Japanese in the 21th century hitherto are as a single nation contributing an unequaled large variety of boobfulness has no peer. Gedankenexperiment: what’s gonna happen, when China liberalizes its policies on porn?
Last but not least there are two questions awaiting at the bottom of this page.