Why is Japanese and Brazilian porn so bizarre? Japan is a first world country so it's not like they're that desperate for money. And even if they were, you could easily be a normal mainstream pornstar in Japan or Brazil. In JAV, the majority of the girls are involved in the normal porn world, but then you can go to the more underground sites and find videos of them blowing dogs.

Sexual repression may explain Japan but Brazilians aren't repressed at all.

Is it just a cultural difference? Is fucking dogs and eating shit just not seen as a big deal in these places? Brazil has the highest population of Japanese outside of Japan. Is it just something innate in the Japanese that makes them enjoy this, regardless of the culture they were raised in?

Do they have some kind of obligation to someone? Are they being forced? I really can't see why an attractive woman who could easily just become an escort would choose to eat feces on video unless they just enjoyed it or they were being made to do so.