as a bi dude I honestly feel really conflicted on the notion of "playersexuality" and hate the term even though there's definitely a bad, lazy version of the thing it describes. a big part of my discomfort comes from what certain games are or aren't built to do.
like, Stardew Valley would fit the definition, no? every dateable character is, generously interpreted, pan. but I'm fine with this setup there, because SV's core fantasy is fundamentally about escaping from the city to the countryside, making a life and a home for yourself, meeting the person of your dreams and settling down with them.
and idk, as someone who wants to make a game in this genre, I'd feel real shitty about telling a player hey, I know you're all ready for this rural escapist fantasy but the cute sculptor girl is never gonna kiss you because you ticked the wrong box at character creation. it's definitely not capital-r Rep to simply take the question of character orientation off the table but I think this choice in the right game can be inclusive in a practical way
or to put it more crassly, video game characters are fake as hell and don't actually feel or want things. I think it's perfectly acceptable to prioritize what your player wants ahead of whatever attributes you're assigning to these characters. obviously if player agency ain't as much of a priority and actual LGBT narratives are, this wouldn't be the route! I just hate seeing this design foreclosed on just because some cishet designers use it poorly