I'd lean towards splitting the difference. Make set sexualities but have an option that lets the player override them. Then just one character max per playthrough is changed and honestly it's not that big of a stretch that one person is bi but leans mostly towards a single gender.
I dunno. If someone is bi, make them bi; but I think that being a sort of default for everybody (with or without coercion!) doesn't really appeal to me even if it does result in fewer "options"! IMHO it makes characters less individual and more generic; and I think I'm too used to characters in TV programmes often ending up being "whatever the script writers want at the time"-sexual which feels a bit cheap, though tbh that's just a subset of characters undergoing complete personality changes, something soaps in particular are especially guilty of doing. Running with CP77 as an example, there's a significant amount of pressure to make Judy "bi" because Panam isn't enough choice for some players, and I hope CDPR doesn't cave in a future patch as Bioware reportedly did with Jack before ME2's release, who was apparently supposed to be bi or lesbian but a decision came from on high that some media outlets might object so it was better to cave in advance, which effectively resulted in no female/female LIs (based on the assertion that Liara doesn't count as Asari are monogendered; still haven't made my mind up whether or not I agree with that, but y'know).
Sticking with Bioware, IMHO I found the characters in Inquisition more interesting from that point of view as they all had clearly defined preferences compared to DA2's playersexual approach. I don't think Dorian or Sera would've worked nearly as well if that wasn't the case, though I do note Sera in particular got a lot of hate and I can't help but suspect this was a significant part of that. OTOH, trying to romance her as an elfy mage, neither of which she approved of, was quite interesting but I think that would've been undermined if it was a case of "why not make it elfy mage guy for the hat trick".
Er anyway, I seem to have meandered away from whatever my point was originally.
