I just think all the romances are forced and unbelievable.
You just crash to Faerun on a mind flayer vessel. You meet these people and spend a few days with them. You do a few things they like and BAM. "Sleep with me."
Lae'zel is Gith, and though I don't think she's what she pretends to be, I would think that she would be WAY harder to romance than, "You killed gobbo leaders. Let's do it."
Wyll has been chained to some demon chick and obviously burned before.
Gale was/is potentially still on love with Mystra.
Shadowheart can't even fully remember who she is.
Astarion...well...maybe. He's free and maybe looking for a good time, but still...with you? In some scenes he acts like you're an insect needing to be squashed.
Minthara...well...ok...she's nuts, so...maybe her as well.
Either way, I still remember the first playthrough. It shocked the heck out of me when suddenly most of the party was propositioning me. There was not flirting, teasing, time spent together having fun or getting to know one another, nothing. It was like 0 to 60. No romance. Just pure sex.
So I wouldn't even called these romance options, just sex options.