Since they are playersexual it will not only make things easier on them, as it will make it better for players who like a certain character and aren't forced to play a gender they don't like just for the romance.
Disagree ...
In one of bigger (and im affraid allready locked) topics, there was interesting idea ... where its autor suggested that characters should have prefferences, BUT ALSO being playersexual ... if you know what i mean.
(My preffered option honestly.)
The first step was to add more dialogues ofcourse ...
But there should be some dialogue that would be just like "well, i never was with another man before, but you ... dunno, w/e" or simmilar stuff, im exhausted and out of inspiration right now.

To put it simply ...
Gale expressed his interest in Shadowheart in your first meeting ... therefore if you play either Human, or Elf, or Halfelf woman ... you should feel that fiting his preference maked his romance easier for you ... than somoene who would play Dragonborn male.

IMPORTANT!!!
Note that it should be only FEEL ... i would not even change the amount of flirting dialogues, or amount of reputation you would need ...
Example: Lets say for Gale preferences are: Gender: Female ... Races: Human / Elf / Half-Elf ...
If you fit both his preferences > first flirt ... he should be flattered, and welcoming your attitude.
If you fit one of his preferences > first flirt ... he should be kinda reserved, but friendly and opened to that option.
If you DONT fit your preferences > first flirt ... he should be surprised with your attitude and admit he never even thought about this.

That way characters would have preferences > therefore they would seem a little deeper.
Yet nobody will be as you said "forced to play a gender (and i would add or race) they dont like just for the romance". Thefore in my eyes, everybody should be happy!

The only question here is ... if Larian would concider this to be good investition of time and resources.
