For the people interested:
- you can romance both SH and Halsin.
SH seemingly has a problem with Karlach in particular (or it's bugged/people did it wrong). You're not a throuple in this case. Threesomes appear to not be in the game at all, claims of discrimination against straight men (and curiously not lesbians) notwithstanding.
Weirdly enough, Karlach might be strictly monogamous after she's cured. That could be the problem (not SH). I still can't find enough info on Karlach's final ending and proclivities. You can romance both SH and Karlach for a time, but not forever. SH will break it off with you and not meanly.
Lae'Zel or Jaheira and SH might work, which is... 3/4 women. Unknown
Are you really trying to turn this around on me and implied I have a problem with lesbians? All I want is a FANTASY RPG in 2023 to be as inclusive and fluffing in its relationships as possible so as many players can enjoy it as possible.
Why all the hate against me and the idea of threesomes? The romantic characters are coded as pansexuals which is great but the idea of three people enjoying sex together is somehow taboo? Why?