Originally Posted by Michieltjuhh
That said, the game does feel quite poly in act 1, since you can sleep around rather freely and still pursue the romance you wanted later on. It's not until act 2 that most companions will make you choose.

Then in Act III there are again multiple options for outside pairings (Mizora, the Emperor, the twins - possibly more I haven't heard of), which some companions are okay with, some need to be talked into, and some will object to strenuously (not sure if any will actually break up with you?).