Gale is perverted mostly because he just tells you how much he loved and still adores Mystra, but in THE NEXT SCENE of the SAME dialogue he hits on you. This doesn't look normal at all
You can make theories about Shadowheart situation and what could be IF... But the thing is, her life is what it is, she was sexually abused, multiple times, regardless of her own position on this in some other theoretical circumstances.
Now I am properly romancing Karlach, so yeah, I agree, despite those lines, she doesn't seem perverted or traumatized. Her past life is a bit ambiguous, but yeah, you can compare her with other romances in other games. And in this play-through Wyll is actually more persistent than Gale - in a very weird way
All in all, I agree that game-design itself has a major impact on how a player perceives romance options in this game.
