I didn't buy it because of the sex scenes. Heck, I didn't even see any advertisements for it before I bought it.
I simply bought it because it was a new Larian game and as I enjoyed DOS1 and DOS2 I figured this game would also be decent.
Finding out that it had sex scenes and depictions of nudity was a welcome surprise because, in my opinion, we could do with such topics being addressed more in video games. To hell with these awkward censorships designed to lower the age rating of the game at the cost of having poorly presented sexuality (Such as "Sex scenes" where both actors are just awkwardly grinding on each other while clothed or worse, like the older GTA titles where picking up a prostitute the characters will just be sat there in their seats with the car rocking)
Without sex scenes, the game would still be good. The underlying game is mechanically solid and there are some well written characters (With a few poorly written ones too *Cough*Emperor*Cough*). I simply like the more recent trend in games not treating sex as some taboo that can never be directly addressed.
Games like Witcher, Cyberpunk and now BG3 offering nudity are slowly helping get over the whole "Scandalous" nature of including sex and nudity. Where they've received fanfare/criticism from its inclusion now because it's considered quirky and different, but eventually this sort of thing can be normalized and it won't be as shocking for it to appear in a game. At which point there will be more focus on how it is used narratively and how it tackles related topics (Like human trafficking, sexual assault, sexualized minors etc) allowing for a more in depth look at a reflection of some of the darker points of a society creating a grittier and emotionally impactful story.
In much the same way that violence has been normalized, so we can easily have games use topics like murder, terrorism, torture, killing of civilians etc. (Killing children still seems to be taboo though... Ironically, BG3 does in fact involve child murder and no-one bats an eye)
