The pornstars in the US are operating within a highly regulated industry in which everyone is religiously tested and it's (well, relatively speaking) rare for them to have sex with people outside the industry, at least without condoms. This makes outbreaks very rare.
In Thailand porn is totally illegal so all concepts of safety and regulation are out of the window, and I'd hazard the guess a fair bit of the porn you have watched might fall in to this category.
You can see numerous known (confirmed by multiple BMs on LBP) HIV+ LBs doing bareback porn, and they're none too strict about age testing either.
If you're using porn in Thailand as base reference for safety ... don't.