The recent Supreme Court decision which asserted that the right to marry is a constitutional right, including for same sex couples, has raised prompted some commentators to question whether the same could be said of polygamy. Polygamy has long been prohibited and rarely practised in the United States, but at least the practise is quite common in many parts of the Islamic world and sub-Saharan Africa. What is increasingly common in the United States, however, are various forms of ‘polyamory’, where people have multiple sexual and romantic partners with the full knowledge of their partners.

YouGov’s research shows that most Americans (56%) reject the idea that polyamory is somehow morally acceptable, though one quarter of the country does think that polyamorous relationships are morally acceptable. Polygamy, that is marriage between more than two people, is even less acceptable, with 69% saying that polygamy is immoral and only 14% believing that it is morally acceptable.

Attitudes towards polyamory depend significantly on how religious someone is. 80% of people who say that religion is ‘very important’ in their lives say that polyamory is wrong, but among people for whom religion is ‘not at all important’ 58% say that polyamory is morally acceptable.