Thank you for putting into words my exact issues with the rise in player-sexual NPCs. It's been a very apparent problem since Baldur's Gate 2 (the original) and has only become exacerbated ever since.

You highlight one of the EXACT issues I've always had with it, insofar that it completely ruins ANY sort of character lore or worldbuilding. Everyone is potentially gay, so NO ONE can have affectations or idiosyncracies that might disrupt that possibility.

For people who still don't get it -- imagine an NPC who has worked hard his whole life, and his parents desperately want grandchildren, but he has never found the right person to marry. Well, in a properly written context, a female player-character would romance him and they would have kids, thus fulfilling his storyline for giving his parents grandchildren.

Switch it around and make it where he can be romanced by male or female characters alike. If he's romanced by a male character, it now makes no sense about his parents wanting grandchildren, elsewise the narrative director would have to (appropriately) write the parents to be disappointed their son was gay. But we can't have that in [current year], because everyone has to be accepting of faggotry. So instead, as logintoblockcommunit pointed out, they simply have to REMOVE that backstory element altogether, make it generic, and ensure there are no story elements related to character traits that might disrupt the acceptance or possibility of faggotry for NPCs.

It's why any game with this "player-sexual" tripe is an instant no-buy for me.