How do you make a Sim polyamorous in Sims 4?
Give everyone in the relationship the Player reward trait from the Serial Romantic aspiration. (Base Game.) You might also be able to add all the people in the relationship into a Polyamory Club and make club activities Be Romantic with Polyamory Club, etc. (Requires Get Together.)
A popular misconception about polyamorous people is that they can't cheat. A polyamorous person can cheat on their partners by ignoring agreed-upon boundaries about dating others, like not telling their partners when they have sex with new people.
The mod that you can do this with is called: WickedWhims. It has the polyamorous trade and the no jealousy trade. You get them by earning points and then spending them in the trade store of your sim to get them certain characteristics.
While Sims cannot have more than one fiancé/e or spouse at a time, they can have multiple boyfriends and girlfriends.
There is no polygamy nor polyamory any further than that in TS3. Sims can only have one partner at a time as there is only one data field to hold that piece of information about them, and "partner" is defined as Steady BF/GF or higher. One exception to the above is for sims who travel to other worlds.
Polygamy isn't natively supported by the game, so you'll need to use a hacked wedding arch that allows for Sims to get married regardless of their current relationship status.
However, polyamory tends to be built around the ideas of honesty, communication and centring the feelings of everyone involved, so in most cases ethical non-monogamy doesn't equate to cheating.
There are many reasons why people cheat, and not all of them are rooted in the person being secretly polyamorous. Some people cheat because they've fallen out of love with their existing partner and in love with a new one. Some people cheat because they have unmet needs in their relationship.
People who practice solo polyamory are not part of a committed partnership or multi-person relationship unit. That doesn't mean they don't have any intimate relationships. It just means they don't live with romantic partners, and they tend to refrain from engagement and marriage.
The Wonderful Whims Mod adds lots of useful quality-of-life features from chemistry to reputation to polyamory.
What does wicked whims let you do?
WickedWhims is a mod created by DRUNKDRIVER for The Sims 4, which adds realistic nudity and sexual animations. It also contains a number of optional features, most notably menstrual cycles (along with menstrual hygiene products) and birth control.
You can also disable the jealousy with Wicked Whims. If you decide to install it, you can navigate like this – Wicked Whims settings > relationships > cheats. Here you'll find the option to turn of jealousy so your Sims won't get affected by it.

Sims 4 Polygamy Cheat Full Friendship Bar. Modifyrelationship FirstName FamilyName Sim1 FirstName FamilyName Sim2 100 RomanceMain Sim1 and Sim2 are soulmates if they have a full friendship bar too (use complete names).
Re: Marriage of relatives in the sims mobile
Only second cousins and beyond can get married.
The other partner may agree to the demand or fight them on it. If the other partner chooses to fight for custody of the kids, this will initiate court proceedings. In the case of amicable breakups, Sims can also amicably agree to share custody of the children.
If you are pregnant, the odds of multiple births are as follows: Single baby: 89% Twins: 10% Triplets: 1%
Along with sleeping or napping in their bed, Sims that are in a romantic relationship can hop into the bed and WooHoo.
There is a small chance that any pregnancy in The Sims 4 will end up with twins; the odds of having twins is about 10% while the odds for triplets is about 1%. But just like players can influence the chances of having a boy or a girl baby, they can also up the chances of multiple births too.
Lack of agreement over time can lead to feelings of neglect and the ending of a relationship. Spending quality, meaningful, intentional and dedicated time nurturing a relationship is essential if it is to be successful. Broken promises around time seem to be the number one difficulty in poly relationships.
Most things about breakups are identical in monogamy and polyamory. They're largely between the people directly involved in the breakup - the worst things that can happen are long-running resentment or making an ass of yourself in wallowing in the end of the relationship with unhealthy coping mechanisms.
Can you be poly and open relationship?
Both open and poly relationships are forms of consensual non-monogamy, and technically, polyamory can be a type of open relationship, but expectations tend to be different when it comes to these relationship styles.
In the vast majority of polyamorous relationships, jealousy does come up at some point. However, jealousy can be broken down to determine what your real concerns are. When you recognize what is bothering you, it is possible to manage this challenging feeling.
References
- https://steamcommunity.com/app/47890/discussions/0/1649917420747691678/
- https://simscommunity.info/2022/10/16/the-sims-4-romance-guide/
- https://www.eurogamer.net/the-sims-4-pregnancy-twins-triplets-boy-girl-7007
- https://www.cosmopolitan.com/uk/love-sex/relationships/a38147968/polyamory-cheating-differences/
- https://sims-4-polygamy-cheat79619.peatix.com/
- https://welldoing.org/article/the-main-challenges-polyamorous-relationships
- https://www.polyphilia.blog/home/polyamory-is-not-cheating
- https://www.womenshealthmag.com/relationships/a19664033/polyamory-vs-open-relationships/
- https://snootysims.com/wiki/sims-4/sims-4-no-jealousy-mod-all-you-need-to-know/
- https://answers.ea.com/t5/Game-Information/Marriage-of-relatives-in-the-sims-mobile/td-p/7001690
- https://www.insider.com/how-do-polyamorous-people-cheat-2019-12
- https://www.thegamer.com/sims-4-turbodrivers-wonderful-whims-mod/
- https://gamerant.com/the-sims-4-how-to-have-twins/
- https://gamerant.com/sims-4-woohoo-location-list/
- https://www.readyforpolyamory.com/post/breakups-in-polyamory
- https://simscommunity.info/2021/10/30/this-mod-for-the-sims-4-will-add-complex-marriage-outcomes/
- https://answers.ea.com/t5/General-Discussion-Feedback/make-poly-relationships/td-p/10443449
- https://www.webmd.com/sex/what-is-solo-polyamory
- https://sims.fandom.com/wiki/WickedWhims
- https://affirmativecouch.com/managing-jealousy-in-a-polyamorous-relationship/
- https://www.wikihow.com/Have-More-Than-One-Spouse-on-the-Sims-2
- https://www.quora.com/How-come-in-Sims-4-when-three-characters-have-the-Player-trait-and-are-all-in-love-they-still-get-sad-Is-there-any-way-to-be-successfully-polyamorous-in-this-game