Tokyo police arrested a 37-year-old man who held a 16-year-old runaway from Kabukicho’s Toyoko area in his home for 20 days, forcing her into paid sex with 20 to 30 men while pocketing most of the money.

So that’s where the JAV get inspiration.
Wait, it’s all in the same ecosystem.

How do you know its a Japanese national and not a gaijin?
Because the gaijin has no “home” to bring anyone back to, he’s still trying hard to find a “home” that can be rented to him.