I can understand that polygamy is illegal. However, some people think that it's simply illegal in a sense that government doesn't recognize it.
It's like Sarah can marry anyone she wish but she can't force Bob to celebrate her marriage with Charlie kind of thing. So perhaps Sarah, Janette, Cindy, can all marry Donny but they can't force government to recognize it.
So what about if a few guys live together with one girl or the other way around? What about if they call each other husband and wife but do not get government recognition.
What laws would get them in trouble?