This appears to have been toned down since release greatly. I had a single character hitting up on me, and that was Lae'zel. Weirdly enough I hadn't even seen any party member hitting upon another. I'd have expected there to be far more "stuff" either way, given the interweb. Additionally, pretty graphical displays of violence far outperform any sexual content in BG3 - perhaps to not upset US audiences, who historically never even registered a hundred heads exploding. But for which a single flash of boobies could see you risked being removed from Walmart outright, thus even adventure games such as Fahrenheit / Indigo Prophecy only getting released censored in the US. Similar to how in Germany, violence in games was risky business, so even tiny pixel soldiers in RTS games were turned into robots bleeding black oil, and all (quite killable) children in Fallout removed outright.
Anyways, romances and sex are the curse of Bioware, another area in which they dragged the genre down forever. https://www.rockpapershotgun.com/rps-at-e3-dragon-age-origins Not because of the romances -- but because they have become the be end all of character depth, with Bioware rightfully nicked as the "Romance company" in circles. Additionally, imagine a traitor archetype of character in your party had developed into a similar must-have feature to be ticked off a list during development; all surprise and wonder would have been gone down the shitter just as quickly.
At least I apparently didn't need to feed, level-up and constantly gift Lae'zel to get the deal done, true Bioware-style.