The whole sex scene thing is kinda out of place imo. I Have not gotten so far as to butt f***ing any companions yet. But being the hot-blooded male that i am, watched a clip on youtube.
And i had a good laugh, i can tell you. lo and behold I saw some good ol' 69'ing in all it's glory taking place in the fantasy world of Faerûn.

What's out of place? Well, larians overall fairytale version of BG. Except for the violence and sex, the overall story and dialoges does not feel like it's targeting a mature audience.
It's very lighhearted and fairytale like imo.

I would compare it to Shrek getting pumped in the a**h*** by donkey while frantically j**rking himself off.
Now ask yourselves, do you really want to have Shrek getting pumped in the a**h*** by donkey while frantically j**rking himself off in your favorite CRPG?
Well, of course not. Even the idea of Shrek getting pumped in the a**h*** by donkey while frantically j**rking himself of is absurd.
Absolutely absurd.