Poly is much more common then you'd think. But it's less about "poly" and more about "why and why not and why aren't we talking about that when I can (or can't) be with you without resulting in neglect". Think about it. At no point do we have any conversation like that. And you can kind of sleep with gale and Astoron but that's more of an oversight I think (that might not get fixed and left in. Why fix it if it's entertaining?). Just saw a youtube vid of it. Those two also are male and neither are female. Lucky gay people.
No offense to you but this is why I feel BG3 is giving people the wrong idea on what kind of game it is. There is so much more to give feedback on, yet a subset of people are seemingly in it for the debauchery.
That is not limited to you either;
same sex acceptance is not because FR shares the same moral values as our modern world.
it is because Greenwood wanted everyone to be bisexual due to him imagining FR as a world of sexual debauchery.
Heres a pointer for you. I FR, incest is considerd a normal family pasttime. Hows that for modern western morals. and no, pornhub is not a standard reference guide for modern western morals.
Cool "fantasy setting" I guess.