That advanced civilization called Australia

From Three in marriage bed more of a good thing, quoting an Australian sociologist named Niko Antalffy:

The polyamorist community includes a large component of tertiary-educated professionals and academics because, they say, they are able to assimilate the intellectual sophistication of the polyamory thesis.

"We now know that sexual monogamy is neither natural nor common and has never been," Antalffy says.

"The institution of marriage and cultural assumptions of monogamy arrived with agriculture and property ownership. In the last four to five decades everything has changed, though: religion has lost its grip on life, we are rich in material goods as well as opportunities, we have greater choices in lifestyles, there's more equality and equality of opportunity, women can make do without having to be married to a man who keeps her.

"And this brings out human desire, which is multifarious to say the least. Polyamory is the sweet result of modernity."

People object to polyamorous relationships of two or more women and one man because the math allegedly doesn't work out. Yet in much of the U.S., especially in the Eastern and Southern states, women outnumber men.