Some of these may be new to you, like:
* Brazilian actress Raquel Karro in some very intense and realistic sex scenes from the 2017 film “Pendular“
* French actress Catherine Guittoneau in a sex scene from the 1995 film “A Single Girl” where there might have been an actual penetration

I’m sad to say this, but in this day and age, any explicit sex seen in a movie is CGI until proven otherwise…
Well, this argument can be used for almost everything on the internet today, not just nudity. But if we’re only talking about nudity, there’s no way to guarantee that any type of nudity from OF creators, nude photoshoots of celebrities like Playboy used to have, scenes in movies and series… There’s no way to guarantee that any of it is 100% real and doesn’t have at least some editing, AI, CGI, etc., and in the coming years and decades this will only get worse.
Especially considering the fact that color grading has been omnipresent (globally, basically) for ~25 years. Once PJ showed what could be done at scale in the LoTR films, it was game over.
That’s true. Even today, many laypeople don’t know that what they’re seeing in these films and series isn’t a real image of an environment, it’s a filter… Chosen by the art direction according to the production’s objectives, etc. Technically called color grading, as you said.