In BG 1 there were no romances at all. You had no approvale system, just a general group alignment and that's it.
In BG 2 there was a general group alihnment as well. But it did have romances. Originally there were 3 female and one male romance option. The commnity later came up with mods to have more options. Those romances mostly were just text, though. Even if someone offered to spend a night with you, nothing was visible. It faded to black completely during a rest.
I myself saw the whole approval system with BG 3 first. I must say i have fun finding out, ho likes what and who dislikes what. And yes, i'm a litte romance addict. I just like things done properly.
