Serviio

What about to add possibility to download metadata from themoviedb of the movies which are tagged as erotic or adult...

Does that not work? Maybe he data is not in the online database, so you'd have to add these.

I'm afraid, it doesn't work. I'm sure the movie is in the database. I found it there. In the table of movies in serviio i found the movie with wrong name and picture (filename is same as the name of movie in the databese, containing the year), or the movie is not in the table. Try Justine (2002).
(Sorry for my english. There is not many opportunities to practise it)