However, sexuality in the Dragon Age has been portrayed in a very normal way. Women and men procreate, sexuality exists and gender expectations exist. To believe that everyone the player encounters has flexible sexuality which bends in the direction which the player fits destroys said world, the fact remains that some Thedosian people--just like real life--are gay, straight and bisexual.
To mock the "realism" shows ignorance of what someone means when talking about realism and serves little purpose.
Just as a note, I think that it is on the player if they find the game world is "destroyed" because the exceptionally small subset of characters that they happen to interact with in a romanceable way (which is already arbitrarily and artificially restricted) happen to be bisexual.
There are plenty of people, including myself, that do not find the game world destroyed by such a thing (though if you have seen my responses about this topic in the past, you'll know that initially I had reservations about it).
If it's a pure flukey foll of the dice that this happens and statistically unlikely, then so be it. But given we don't even have orientation demographics it's not really something that can be said with any sort of accuracy.
Because it isn't "everyone the player encounters." It's the exceptionally small subset of people that are even willing to have a romance with you. Which already bends the realm of any sort of believability if taken in a literal, world defining sort of way.