Look I understand the whole "companions are too horny" I agree! I feel like there should be more interaction or whatever!
But let's not forget that during the tiefling party from what I perceived the romance was just a mere hook up! And whether you continue to pursue a relationship with that companion is entirely up to you, or if you move on to someone else or not! Since again it was a party with alcohol and different people in that environment react in different ways!
I think a lot of folks are calling what we have 'romance' because Larian are calling it romance... if it were distinctly not so (as the Fane hook-up at the beginning of D:OS2 was not), then I'd hope they wouldn't be calling it romance... but they are, so it seems that it's what we're working with, like it or not.