Uhh....lol dude. Polygamy by definition is more than two consenting adults. Unless this is a joke/sacarism- which in that case well done.

Yes Yes my bad lol... I wasn't joking unfortunately I didn't fully explain myself
I meant as long as it isn't a minor, someone being forced and each party is aware of what they're getting into. Two individuals who knowingly enter into a marriage where they know their spouse has another husband or wife is okay with me.