I think Larian decided to give us freedom of choice instead of "realism" on this particular point, like in the D&D paper game maybe, where possibilities are unlimited (depending of your game master).
And in a way, that's respectable.
I can understand that you could eventually feel some discomfort when a character try to seduce you and it's not your kind of partner.
But i also feel like whatever the choice is someone will disagree with it.
Like "Hey ! Why can't we romance this one ?" or "Hey, we should'n be able to romance this one."
Personaly, i appreciate having the choice, and plenty of choice, so that a new run will offer new possibilities to try, or not.
