Well, I for one would love if they looked at DA2 in the romance part as a reference. In there, yes, unless is Sebastian, a DLC character, all of the romanceable companions are bi, and that's it. however, you can feel that their sexuality is present in a way that certain characters feel better or open themselves more in relationships when romancing a certain gender, etc.
But I think doing something like this would be way too big for Larian at this point. Too many choices would be locked, etc. I never had an interest in playing BG1 and 2 because of this. Romance is a great part of what attracts me in RPGs, but the gender AND race-locked romances kept me away.
