Bigamy is the unlawful act of knowingly having two or more wives or husbands at the same time, with the second not knowing about the first. Polygamy is the practice of having multiple wives based on religious beliefs, with all wives aware of, and agreeable to, the husband having several wives. The wives of polygamists refer to each other as "sister wives".
With polygamy, the more common practice is to have a legal marriage with the first wife, then the subsequent marriages are performed by an elder of their church instead of having a legal marriage ceremony as is done with their first marriages. This is their way of avoiding prosecution, since they know the subsequent marriages are not legal, nor are they recognized in any way by the state. So only the first wife receives any benefits as the legal spouse, with the sister wives receiving none.
In the United States only the first marriage is legally recognized. Any subsequent marriage, without obtaining a divorce, is invalid.
There's no historical basis to say when it started. Polyamory means simply the love of many, & covers several possibilities. There are references in ancient historical records of orgies, polygamy, and group relationships that predate our concepts of monogomy.
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Polyamory Married and Dating - 2012 was released on: USA: 12 July 2012
I personally subscribe to the belief that everyone should do what works for them and if a polyamory relationship is what it takes to get someone to a happy place, then I'm all for it.
Yes, it is true that polyamory is illegal in 21 states in the United States. These states have laws that criminalize consensual non-monogamous relationships.
Polyamory Married and Dating - 2012 Serious Affairs 2-6 was released on: USA: 19 September 2013
When a man has multiple girlfriends simultaneously, it is often referred to as "polyamory" if all parties are aware and consenting. If he is in relationships without the knowledge of the other partners, it may be considered "infidelity" or "cheating." The term "polygamy" specifically refers to being married to multiple partners, which is a different concept.
polyamory?
Polyamory Married and Dating - 2012 Boundaries 2-5 was released on: USA: 12 September 2013
The Montel Williams Show - 1991 Multiple Love Polyamory was released on: USA: 29 November 2005
Polyamory Married and Dating - 2012 Disconnected 2-3 was released on: USA: 29 August 2013
Polyamory Married and Dating - 2012 1-1 SUSPENDED was released on: USA: 12 July 2012