I have to admit, thinking about the argument, I would not like or use such a chance if it was present. I admit it may be some kind of my limtation, but the thought of being in a relationship with more than one person, is quite sikening to me.
maybe because I'm a little a gelous tipe, but I would totally hate my patner to have...another partner beside me. be it another woman, or man. I'm all for monogam.
(hey, I don't like even the extramarital (is that the word for realtionship outside marriage?) realtionship, and I never made on of my warden a mistress. I feel it as degradating)
so...no, not even in fictional relationship I can really say I would like to se something like that.
of course, I would not cry at the oultrage if such thing was added in the game (since, after the all bi, I can't really say nothing, if not that the sims is more realistic) I would just not use it...but I would really miss the gelous interactions with the companion. Marrigan jelous of Zevran was hilarious!