The answer is simple, Larian owes their big success with BG3 entirely to bear sex, not story, world building (although the name Baldurs Gate helped) or characters. You can see this for example in the first threads that sprung up on this board after the announcement were about asking for more sex.
So to repeat the BG3 success as Larian stated they want to they have to add more sex and they added those scenes to the trailer to ensure their fans that they will porn it up more.
This must be a delusional or purposely misleading take (I think the latter given the general attitude of your average post), EA numbers speak for themselves, more than 2.5m copies sold, there were black screens for sex scenes in EA. If story and world building were objectively worthless then no amount of marketing wizardry would save the game from fail. Success factors in a lot of variables and blatantly stating that it stems from a single marketing decision or even one aspect of the game is wrong. I would appreciate if you'd save your bile for topics that are worth of it. Also the majority of threads are not sex related.