Just going based on stats. Of the top ten best selling games of 2021, how many are truly Mature?
Um, try comparing games that are actually in the same genre? You literally can't compare BG3 to Super Mario or Minecraft. That's not apples and oranges, that's apples and.. erm.. jellyfish? Two totally different worlds. They might be in the "best selling" list but vastly different people buy the games on this list, for vastly different reasons.
To me, BG3 is comparable most directly to the Dragon Age series (well that's what it reminds me most of, anyway), and perhaps The Witcher series - all of which have had romances in them. Also, the BG series seems to have always had romances as part of the story.