The sex scenes are good in the witcher 3 though. And romance in DOS2 was fun, I agree.
My favorite romance was in Dragon Age Origins with Morrigan, cause it was so difficult to get her that it was a minigame in itself. But the devs made sure she was hot as hell to keep you interested lol. That's the kind of romance I would like in BG3, something interesting because the character you are flirting with is interesting and well written.
Sera in Inquisition was fun, and interestingly hard work when playing a mage character. I would hope romances are more like that than the rather threadbare efforts in e.g. Skyrim.
Sera was one of the best written characters I have seen in the series. (IM 'not so' HO) It was fun acting the part of an elven mage in my first play through, not knowing that I had doubled the difficulty. Her character seemed to develop in a fascinating way, particularly if she came along for the tour of the fade!
I have to say that I find the odd ball characters some of the most fun to include in parties.