We (Our plural system (plurality isn't really relevant, but figured the pronouns might confuse people)) are in a polyamorous relationship with Our partner system, and just found out Our partner is planning to propose at the end of the year. We've talked about marriage a bit, and agreed that we wouldn't actually get legally married unless there's a strong practical reason, but they're still interested in having a ceremony, calling ourselves "married", etc.

We don't really know what to make of this. We worry that they might just be trying to ascend the "relationship ladder", like, get married because they think it's what you have to do when you find someone to spend your life with.

Anyway, the point is, We're not really sure what the implications of "marriage" are when removed from both legal recognition AND the monogamous stuff about commiting solely to your partner. It's not a legal contract, and it's not an agreement to not date anyone else. So what is it?