I much prefer the slightly credulity-straining conceit that we just happen to have met a bunch of bisexual people (which could happen, there are presumably at least thousands of them in Faerun, if not more), then the less ideal situation of people being disappointed that they cannot romance their favorite character while playing as their preferred gender. I remember a friend of mine who really wanted to love Dragon Age: Origins, but actually he ended up hating it, because he couldn't romance Alastair as a guy. I've seen tons of posts across the internet expressing angst that a particular character is only straight, or only gay.
