First, blood and murder - this is already adult content. For images of blood, organs (the brain from the first scene), the game already increases rating. Secondly, if you are talking about sex, then Lae and Astarion scene still being worked on, I assume that they will have cutscenes similar to Minthara scene. Does that seem to be enough? This is not a porn game, you don't have to wait for a porn scene every few minutes or rude expressions like in Cyberpunk.
To be honest this is why I don't really like CD Projekt works. It is not necessary to make everything vulgar.
Actually the only area in the game that seems relatively dark is the first couple rooms in the intro. The rest of the game came off as PG13 (haven't fully done swamp or touched underdark).
I was actually thinking the game would be more of how that was before I picked it up.