There’s a video of one of the japanese gay porn actor doing podcast on Youtube, it was an hour podcast full in Japanese, i forgot the title or the chanel, i’ll try to look it up when i have time.
But he says that porn actor/actress is still taboo in Japan, but sex worker’s not, the actor on the scenes are likely to be complete amateur and a complete nobody that’s just being randomly approached on streets, bars, gym and social media, and the production houses really make sure to keep their talents privacy safe, that’s why they use codes instead of title or including the model stage names since it’ll be harder to track down their identity.
For the “pornstar” population especially gay ones not being mentioned directly on the podcast, but my assumption is there’s not as much as in the US, OF JFF etc is also not a thing in japan, and most of the guys are just hottie rando they found on the streets