While I respect and value people in polyamorous situations where all partners have equal standing in the relationship, and I am firmly in favor of removing sex-based restrictions from legal marriage, I can't see any way that legal marriage could be changed to incorporate multiple parties. One particular snag that I frequently consider is that of inheritance. Multiple inheritance in the case of multiple marriage would be a headache and a half to define clearly in a legal sense. :|
Since polyamorous people are not restricted from marrying their one primary partner (a common arrangement in such relationships) if that person is of the opposite sex, I don't think this legal argument needs to take the spotlight at the very least until same-sex marriage is secured. One legal change that might need to be considered though is the definition of adultery -- I think that in some cases adultery charges can legally be pressed even if all parties involved approved of the extramarital "affair".
Since polyamorous people are not restricted from marrying their one primary partner (a common arrangement in such relationships) if that person is of the opposite sex, I don't think this legal argument needs to take the spotlight at the very least until same-sex marriage is secured. One legal change that might need to be considered though is the definition of adultery -- I think that in some cases adultery charges can legally be pressed even if all parties involved approved of the extramarital "affair".
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