Should Having Multiple Spouses Be an Option?

"PenguinFoop;c-18055697" wrote:
What happens if three people get into a consensual relationship and one of them gets jealous that the other two are spending more time together than with that one? Or if there turns out to be a personality clash between two? One person will have to make a choice. This happens in monogamous relationships often enough. Add more people and you substantially create the potential scenario.

You answered you own question there with "This happens in monogamous relationships often enough." - You do the same things monogamous couples do. Talk it out, try to resolve the issues, if issues cant be resolved then consider leaving the relationship. In the case of a throuple and one being upset, they might end up as a couple and a single, rather than 2 single sims. Otherwise, the issues are the same.

If it was a marriage situation, then each person would be legally married to each person they were romantically involved with, and would only need to dissolve that part of the marriage, not marriage to everyone. Every pairing of spouses is treated as an individual marriage, and thus can be dissolved.

Just like sims can join in the relationship at any time, they can leave it the same way.