I am wondering how much you have researched poly. There is no one definition and no one way. Just the same with marriage I think.
There is one way to marry; go and sign papers with a couple of witnesses and a registered person that can make it legal and/or have a ceremony/event whereby you speak of your undying love for another/others. There is no right way or wrong way to do poly or marriage. It's all what comes after I think... are you creating more happiness, love, family, sex...? are you fulfilling a dream/wish/hope? are you staying true to your values and bringing people into your life that also value what you do and are willing to expand on that with you? These are the questions that are more worth asking rather than should I marry or should I be poly or both.
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