You can also edit it's like/dislike tags and even add or remove inclinations. Try a bit of everything and see if you can remove whatever is trolling you.
Selunea
Recent community posts
Even if you wait for the patch, it may not solve it, since it may me hard coded in your save data. I'd suggest tweaking a bit with cheats enabled, and see if you can alter that partner preferences or likes, see if that forces an update of its status. Save before and right after doing it, if you are gonna try.
If you really haven't 'messed with' anyone else, it may be a bug; At least the accusations.
If your partner has the 'open relationships' tendency, it may still try to convince you from time to time. Not having the 'cheating content' blocked also facilitate that kind of situations. AND remember that not giving enough attention to them, may also trigger that.
You can form polycule dates, and even tip the odds of them getting to know each other on good terms. That being said, it doesn't seem that they will evolve their relationship without your direct action. If they themselves are poly or open, they may develop other relationships without you getting involved.
Futanari or similar are out of the question, at least on the actual roadmap. Quite some ppl would like it added, but "it would break the realistic IRL simulation of the game".
Can't really tell if they would add a version with it post release, or maybe surrender the rights to mod the game, but it's a no-no for now.
Go to the place that catches you eye (university suites, city apartments, etc). You will find either a new option to discuss renting or a place called lobby, where you will find the option to do it.
Once rented, you can invite someone to either your room and bed or as a roommate. Specifics can be found on the patch notes.
I find it kinda funny how you edited your post to try and put blame on the community, all while having a faulty narrative where you contradict yourself at every turn:
1. If it's an adult-sim (your own words), FUTA doesn't exist IRL. While I do personally like that 'philia', it has nothing realistic in it.
2. You talk big about non-binary and trans content and romance, but it exists and, in fact, this game has much more detail about that than almost any other out there, making the exception of Degrees of Lewdity.
Personally, I don't consider this a 'realistic sim' at all, since there's open sexual harassment and bullying, something heavily prosecuted in big 2026, specially when it involves young people. It's just a matter of the vision the Devs have and what they like or dislike. Then again, it's their game, so it's their rules; I just miss an updated list of tags that they won't be ever adding to the game, so we can at least bring closure to this arguments.
All of that being said, you are either trolling and seeking your '5 minutes of glory' (hence all the downvotes), or never actually played this game (again, deserving the disdain from the real community).
Edited: Some typos
Sounds fair... If you are a top tier backer in Kickstarter. Since what you demand is costly, I'm guessing you are single-handed funding them?
With love from: A non entitled backer that shares your passion, but knows that it would mean x3 the work, and surely having to swap from web to a real game engine.