Which is probably why you and the OP had such different experience.
Split screen did seem to have some bugginess whereby side characters would randomly decide they wanted to fuck whichever player talked to them first, regardless of past interactions.
other than that i do remember the companions being really horny for me at the big camp party in act 1. i did find it jarring but one perspective that i liked was that you could look at it as casual sex - games usually treat sex as an end goal for relationship mechanics. its still hard to square it up with almost everyone wanting to get in your pants - but i think that's a by-product of making sure players have choice and i can live with that. it also only happened to me once and once i turned everyone down i wasn't interested in they left the matter alone ( except Gale lol )
I found it outrageous that shadowheart was so reticent, while simultaneously encouraging polyamory and saying she was down for a hooker foursome. Three side characters offered to fuck before shadowheart. Felt like those narratives either should have been much longer and deeper or not there at all.