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In reply to the discussion: The gay marriage decision has put us in uncharted waters with regard to polygamy [View all]quaker bill
(8,224 posts)Societies in history have legalized same sex marriages...
"Same-sex unions have been recorded in the history of a number of cultures, but marriages or socially-accepted unions between same-sex partners were rare or nonexistent in other cultures. In the late 20th century, religious rites of marriage without legal recognition became increasingly common. The first law providing for marriage of people of the same sex in modern times was enacted in 2001 in the Netherlands. As of 26 June 2015, eighteen countries (Argentina, Belgium, Brazil, Canada, Denmark,[nb 2] France, Iceland, Luxembourg, the Netherlands,[nb 3] New Zealand,[nb 4] Norway, Portugal, South Africa, Spain, Sweden, the United Kingdom,[nb 5] the United States and Uruguay) and certain sub-jurisdictions allow same-sex couples to marry. "
Via Wikipedia
There is a difference between which individual person of what gender one chooses to marry, and whether one chooses to be married to several individuals at the same time.
These things are sufficiently different that one being legal does not imply the other.