In much the same way, it is not a crime in most places for unmarried people to live together, and start families. The phrase 'polyamory' is sometimes applied to romantic relations among multiple adults. But marriage, no longer defined as a relation between one man and one woman, is still defined as a relation between two people (but now they can also be of the same sex). That "two-ness" may be starting to change too.
The WSJ has the story:
Utah Lawmakers Seek to Decriminalize Polygamy
Sponsor says bill will help ‘otherwise law-abiding consenting adults who practice polygamy’
By Talal Ansari
"Utah could decriminalize polygamy for the first time in 85 years.
"Lawmakers in the state House are considering legislation that would reclassify bigamy as an infraction in certain circumstances. The Republican-controlled Senate unanimously passed the bill earlier this week.
"More than 60% of Utah’s population belongs to the Church of Jesus Christ of Latter-day Saints, colloquially known as the Mormon Church, which practiced polygamy early in its history but banned it more than a century ago.
"Under current state law, bigamy is a felony, punishable by up to five years in prison. Bigamy is a legal term, defined as marrying someone while being legally married to another person.
...
"Utah Attorney General Sean Reyes has said his office only prosecutes bigamy crimes “against those who induce marriage under false pretenses or if there is a collateral malfeasance.”
"Sen. Henderson has said her bill would essentially codify the attorney general’s prevailing practices into law.
...
"Polygamy was outlawed in the U.S. in the 1880s. The practice was banned by the Mormon Church in 1890, as Utah sought statehood. Utah wouldn’t become a state until 1896, under the condition that it explicitly ban polygamy in its constitution.
"Since then, the state and the Mormon Church have taken a hard stance against polygamy, with the latter excommunicating its members for engaging in plural marriage.
"In 1935, the state criminalized bigamy. Those moves pushed polygamists to the fringes of society and in geographic isolation.
"The law has been challenged over the years. In 2013, U.S. District Judge Clark Waddoups declared unconstitutional a key portion of Utah’s polygamy law after it was challenged by stars of the reality-television show “Sister Wives.” An appeals court later dismissed that decision and the Supreme Court decided not to hear the appeal.
"According to a Gallup poll, acceptance of polygamy appears to be increasing in the U.S. In 2018, 18% of Americans believed marrying more than one person was morally acceptable. In 2003, 7% of those asked took the same stance."
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In common usage, I think "bigamy" refers to one person having two spouses (often a man with two wives), but it sounds as if, used as a legal term in Utah, bigamy includes what used to be called polygamy, the situation of having more than one spouse at the same time. The usual form of polygamy is polygyny, when a man has more that one wife. A less usual form of polygamy is polyandry, when a woman has more than one husband.
All these terms arose when marriage, even multiple marriage, was thought of as between men and women. We may need new terms for plural marriage now that we recognize same sex marriages. For example, in a plural marriage of the future, will all the members be married to each other?
This would make legalizing plural marriage potentially more difficult, in terms of defining the legal status of all the spouses, than was legalizing same sex marriage. In the case of same sex marriage, all the customary rights and obligations of traditional marriage in each state could be extended to same sex couples by a judicial order. But, e.g. how does divorce work in a plural marriage--is it pairwise, or is it more like dissolving a partnership, or resigning from a partnership? Can some parts of the marriage persist while other parts are dissolved?
This suggests to me that it may be some time before we see new, plural forms of marriage enshrined in law. But I wouldn't bet the farm against it in the long term.
(In the meantime, I think we can say that if you support plural marriage, that's big o' you.)
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*In a geographically related story, the Salt Lake Tribune reported last week
BYU students celebrate as school removes ‘Homosexual Behavior’ section from its online Honor Code