My concern about showcasing a more precise sexual identities (outside of Hetero, ******, and Bi) is that I can see "vanilla" getting hedged out in favor of "co-opting" the gay and straight options for other sexualities. You see this already with Iron Bull and Josephine as a BDSM and asexual/chaste relationship (respecitvely) essentially "taking up" two of the options. Now, if you are playing a Gay male PC but you aren't into BDSM.... well better hope you like Dorian. The same goes for Josephine, who I've seen both straight guys and lesbians express disappointment in her romance arc not having any overt indication of sexual expression, but who is our only "other option".
I've never done Bull's romance, but I've watched parts of it. I was surprised by the direction it took. BDSM is something I'm pretty aware of from friends of mine, but not a personal preference (well, at least I don't think so. Maybe some of my preferences count, who knows?
). People I know who are into it vary from purely bedroom fun to full blown "lifestyle" (sorry, that word is terrible, I know!!) in that it influences all aspects of their lives. That latter part is something I really don't get at all - but hey, if it's truly consensual and not harming anyone involved, then who am I to judge?
I guess the only "issue" I can see with Bull's romance arc is the fact it is 'forced' on the player, and also you're pigeonholed into the submissive role. The reason I quoted your post is because I'd share the same thoughts on getting very precise with sexual identities/preferences as well, given that there are a finite number of romance options. I always go for female same sex romances, so Inquisition is probably the most limited RPG with those options that I've played. Sera, while I grew to like her, was just not a good fit for my Inquisitor. Josephine's romance was actually pretty sweet, but I see how the Disney quality wouldn't have impressed everyone. Personally, I would have liked some sort of more overt scene by the end - however given Josephine's character and personality, I think the lack of sex scene fitted the story. I imagine she'd be the type to maintain propriety for as long as possible and have a pretty long courtship. And, similar to the IB romance, it's pretty cool that a different type of romance arc was available. Not all romance arcs need overtly sexual content - but of course if some do have it to some extent (Sera, Dorian, Cassandra), then the other players might feel annoyed. The specific options taken in IB and Josephine's romances do cause a bit of an issue with choices for players.