Moral issues?? It's a fantasy game with consenting adults who know what they are doing.
Game of Thrones is famous for having incest.
The Office has a main character who is an ignorant, racist horrible person who sexually harasses people.
Dexter makes killing okay because he's killing murderers.
Breaking Bad glorifies drug use.
Black Mirror... well that has ALL sorts of issues including the topic at hand.
That doesn't stop the shows from being good or interesting.
The one thing Baldur's Gate shares with all of the above? They are works of fiction.
Anyone who is hung up on this needs to take a step back and do some thinking about themselves.
If you don't like something, vote with your wallet. Don't support it.