I disagree with the OP. It is better that the game doesn't make a big deal of it. There doesn't need to be some pronouncement of "I'M GAY!" just like there doesn't need to be any statement towards a member of the same gender saying "I'M STRAIGHT". It is simple enough that you can politely decline or accept any and all advancements from NPCs that aren't welcomed. It doesn't feel contrived or fake, it feels sincere because it truly doesn't matter. If you make the right choices in game, an NPC will be interested in you, or not, your choice. Any microscope on their sexual preference is a waste of time and cry for attention. Maybe in Forgotten Realms they have gotten over the need to label themselves. We could only be so lucky.
