Apparently there is more than one way to acquire the Amulet of Mara which is required in order to get married.

Is it possible to be married to more than one partner at the same time?

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3 Answers

No.

Wearing the Amulet of Mara while you're married no longer triggers dialog options. You must kill your current spouse and wear the amulet to bring up potential "Are you interested" dialog options again.

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This mod claims to allow polygamy.

Marriage Mod - To Have & To Hold

You could kill your spouse then marry again then do the console command "resurrect" on your dead spouse and then you have 2.

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