EA will do nothing that jeopardizes the games rating so this will never happen.
I mean, at the end of the day the worst you're ever going to see in base game is some covers moving around. Why should a romance that is unconventional by some people's standards be seen as automatically too mature?
So, I mean the entire point of this thread is a type of queer relationship that the Sims does not support. Your comment shows your lack of knowledge when it comes to this issue and queer issues in general so I'm not sure why you're commenting on this thread.
I have some throuples in some of my games. I even have a post about how to get polyamory to work here: https://answers.ea.com/t5/General-Discussion-Feedback/make-poly-relationships/m-p/10443449#M50356
I actually really like the new Loyal trait, because while I do play with polyamorous couples, I almost never play with infidelity. (I had an evil, noncommittal Sim have an affair with Don Lothario for a storyline, and I have played Black Widow, mainly because it was out of character for me and I wanted to break out of a rut.) But it would be nice to have some poly rep in the game, I agree. Poly acceptance is lagging behind LGBTQIA acceptance in society in general and the game in particular.
(That said, I was thrilled to have Ace visibility in the sexual orientation update, since my bestie is Ace. Also Aro rep. In general, I really like the sexual orientation settings, guys! But I agree that more poly rep would be nice.)
So the MCCC trait prevents the "Loyal Sims don't cheat" bit of the trait? That's great! I was worried I'd have to download more mods to get a Loyal trait that didn't interfere with poly couples.
This is kind of a side issue and I don't want to get too off topic, but...
In addition to gays and straights, there are also bisexuals/pansexuals and asexuals, and people who are transgender. Also, these things are considered by many to be a spectrum rather than an either/or thing. I really like how the game settings allow us to separate woohoo interest and romantic interest, to rep our Aro and Ace friends (or ourselves, if applicable!). I would love more nuance to represent demisexual or genderqueer Sims, however. Right now I'm setting my demi Sims as not interested in woohoo at all but exploring, which is... probably close enough, gameplay-wise, but I make a face at the idea of demisexuals "exploring" as opposed to being secure in their demi-ness.
The team is aware of how heavily gendered the game is, and this, sadly, impacts trans and genderqueer rep. As I said, they're aware and say they're working on it.
