I've lost the plot a little, why are graphics being debated? Are we saying if the sex scenes had more or less graphical fidelity it would affect their rating? We're also dealing with a drastic change in the social mores around video games, the biggest whale in gaming, Grand Theft Auto, spurred a moral panic in 2005 when files for a sex minigame were found in its code, cut to 2013 and one of our main characters is introduced mid-coitus, shortly before murdering his partner's boyfriend (a main character from a previous game no less). That was 'edgy', GTA often plays with the line between exploitation and camp, neither of which I'd accuse BG3 of being yet.
People who think there can't be sex in older games just haven't looked too closely at the modding community. In one of the other myriad threads on this topic, I learned that one of the most popular mods for Neverwinter Nights is A Dance with Rogues, which was created by someone who felt frustrated by the relatively sexless worlds her fantasy games existed in. Now we're getting a game that actually deigns to transgress this topic, and people want to nag it for trying. Ho Hum.