It will be up to the writers I guess.

Is Astarion asexual? Gale? Wyll? Shadowheart? Lae'zel?
Maybe some of them are, maybe some of them just aren't?
From what I have seen so far, the advance in romance is tied to "getting it on" with the characters inevitably.

I think Larian needs to give the players very visible options to advance also physically or only mentally, if wished for it.
Maybe this will not please Astarion or Lae'zel, but it will intrigue Wyll or Gale?
They should in any case not all be the same.

That would feel very shallow to me.