@digitanswer said:
How to Completely Exclude Adult Content from Discover API Results?
Hi!
Is there an option to completely hide any adult or pornographic content?

No.
These are the users who add movies to the Database.
The user who adds the movie, when the movie is pornographic, must select "Yes" in the "Adult Movie?" option.
Only movies with this option set to "Yes" will not be displayed in a request with "&include_adult=false".
So it may happen that a pornographic movie recently inserted here appears in a search.
And some old ones too.

I understand that the API doesn't explicitly filter out erotic content (e.g. nudity, implied sexual acts),
but I'm looking for a way to limit or remove such cases.

You can change the "Adult Movie?" option to Yes yourself.
In the case of your examples, all 3 were set to No.
I have already changed it to Yes.
https://www.themoviedb.org/movie/1304758-no-1style-av-sone-218/edit?active_nav_item=primary_facts
https://www.themoviedb.org/movie/1355783-inuman-session-with-avina/edit?active_nav_item=primary_facts
https://www.themoviedb.org/movie/1386744-happier-than-ever/edit?active_nav_item=primary_facts

The issue is that when trying to fetch data such as the most popular movies, currently playing movies, upcoming movies, etc., using the discover method, even with adult=false, adult/pornographic movies still appear.
For example, when looking at the backdrop_path image of some results, it’s clear that they are adult content.

Example:
https://api.themoviedb.org/3/discover/movie?api_key=X&include_adult=false&include_video=false&language=es&page=10&primary_release_year=2024&sort_by=popularity.desc

Result:
https://www.themoviedb.org/movie/1304758-no-1style-av-sone-218

Other examples:
https://www.themoviedb.org/movie/1355783-inuman-session-with-avina
https://www.themoviedb.org/movie/1386744-happier-than-ever

Could you please let me know what I need to do to filter out all such cases?

Only what you suggest above.
Change the "Adult Movie?" option in films from No to Yes.