One of the most praised parts of 's gameplay is its rewarding romance system, where not only can you romance your favorite companion, but also romance two if you do it correctly. From early on in Act One, all the way into Act Three, you'll be able to pursue a relationship with any of the companions that join your party over the course of the game, aside from Minsc and Jaheira. You can't introduce polyamory to your game until later on, as it'll take some trust built up between yourself and your original partner first.
You can choose to romance any of the main companions, and romancing them each takes a bit of a different effort. The main thing to remember is to make choices that you think align with their character. For instance, in order to romance Karlach, players should always take the chance to be a hero, as Karlach's past as a soldier informs her present-day desire to always do good. Not every companion will be okay with you taking another lover, though, so you'll want to check with them first before you go gallivanting under the sheets with someone else.
The feeling of love in Baldur’s Gate 3 has just gotten a lot more intense due to the updates added with Patch 6, including improved kisses.
Of all the companions in, only two of them will always force you to choose. Wyll and Gale both confront you if you try to romance another character while committed to them, giving you an ultimatum that either you choose them, or end your relationship entirely. As for the others, it's a bit more complicated. Here's each romance's path, and when each character is/isn't okay with polyamory.
Companion
Act One
Act Two
Act Three
Shadowheart
Fine with it, as long as it isn't with Lae'zel.
She will ask you to become exclusive or break things off.
Exclusive only.
Astarion
Fine with it, reluctant to share you with Shadowheart.
Fine with Halsin and Minthara, but you'll need to have a conversation first.
Fine with Halsin and Minthara
Karlach
Fine with it.
Once her
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