make poly relationships

I had an accidental poly household. I had 6 single sims and they NEVER got upset when the others flirted with who they were kinda paired up with.  The eco life NAP free love was on and I didn't know (it ruined the plot challenge for me but may work for you as an option as mine weren't meant to be poly)

We're they all dating or just flirting? 

Hi,

You would need the player trait on all the sims in the relationship.

Player is obtained upon reaching Level 4 of the Serial Romantic aspiration. Sims with this trait will never cause another Sim to get jealous of their actions, such as using a Romantic-type interaction on a different Sim in front of their spouse. Note that Sims with the Player trait can themselves still feel jealousy (unless the Sim who would make them jealous also has the Player trait).

That's for the flirting part. If you want them to be dating you would need to add mods, as the base game doesn't allow polygamy.

Mods can add multiple boyfriends/girlfriends and even marriages.

Love is free.

I accidentally created a situation where a couple I'd created broke up because they had different life aspirations and the woman found a new man who she married and had kids with but since I had free will all the way up she kept going back to her ex because they were still technically soulmates? Anyway, I decided I wanted to keep the three of them together so I cheated to give both parts of the married couple the Player trait so that nobody would get jealous (traits.equip_trait trait_Player). It worked and now all three of them are able to do all the romantic interactions to the point that now the married couple are also both dating the third part of their poly couple. For good measure since I had the Get Together expansion I also added them all to a closed club that had them all have romantic interactions with each other but even before that nobody was jealous and they were all in relationships so all well that ends well. 

I've found that the best way to make poly sims is to use the player trait but also, in the case of marriage with poly sims, you can use the cheat relationship.add_bit <SIM1ID> <SIM2ID> family_husband_wife on all of the people within the relationship so it registers them as married

Can you go into more detail on how to do this please

@HeyTifferz 

Mods:

MC Command Center:  The MC Woohoo module includes a "disable jealousy" option under MC Woohoo -> Woohoo Reactions

Wonderful Whims: You can give your Sims the "wonderful attribute" Polyamorous!

No mods (does involve cheats):

Base game:  Control-shift-c to open the console, testing cheats on , and then Traits.equip_trait Player.  If you want extra satisfaction points as well, instead turn on testing cheats and then set their aspiration to Serial Romantic and type Aspirations.Complete_Current_Milestone  until the aspiration is achieved and the game gives you the Player reward trait. Do this for all the Sims you want to be in the relationship.

Get Together:  Press the U key to open the club interface (if you have Discover University it might show you university organizations instead, but there's a tab to show you clubs). Create a new club ("Polyamory club"?) and add the Sims you want to be involved. Add the club activity "Be romantic with" and choose for the target of that activty your club ("Polyamory club"?). I like to add banned action, "be mean" as well because that's the way I roll.

Eco Lifestyle:  Shift-click the mailbox and choose Instant Add NAP (cheat) and choose the Free Love NAP. Just be careful, if this is the only one you're using, to only be romantic at home because the no jealousy part only works in the neighborhood.

I've had a number of sims I've worked through the Serial Romantic aspiration with, and even once they have the Player trait their other boyfriends or girlfriends still get upset when they see the Player sim being romantic with someone else - it's a hit to their romantic and friendly relationship bars and also to their reputation! Personally I don't believe a married sim has any right to get upset about their boyfriend or girlfriend having other lovers in the first place, but the Player trait being broken is really annoying.

Using Clubs and making "be romantic with" a club activity would only work while they're officially in a club meeting. Which wouldn't be a problem if you just stay home, but if you go out for the day you'd have to remember to announce a club meeting everywhere you went - I can see that getting very tedious.

Why is only gay an straight an not to mention Singular weddings allowed but not polygamy weddings yet there’s a polygamy pride flag and wedding topper this need to CHANGE! It’s so unfair I was so excited downloading weddings stories which I’d say was well worth the money despite the disappointment of non existent polygamy weddings factor but the rainbow fashion an the adorable decor is great an all but if we’re talking LGBTQIA+P here we need to include polygamy weddings an relationship That’d be well appreciated since it is pride month, can’t make a rainbow if you don’t have all the colours to make it after all.