Many people criticize the concept of an "open relationship", that is, a relationship in which both partners are allowed to have sexual relations with people other than the primary partner. There are also other forms of so-called "polyamory", for example a three-way relationship which excludes sexual relations with anybody besides the other two partners. While in some cases such relationships may only benefit one party, may involve coercion or neglect, or sacrificing for one's partner, there are some such relationships in which both or all partners find themselves more fulfilled and happy than they otherwise would. Yet these "good" polyamorous relationships are the subject of the same moral aversion and disdain as the abusive, coercive ones. What kind of moral argument could lie behind the idea that such relationships are wrong - surely not a morality based on happiness. Is some kind of deontological sexual ethic at the root of the criticism of open relationships and polyamory? What does this ethic look like? Why, in short, is there opposition to polyamorous relationships that goes beyond mere personal disagreement?

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I will leave it to others to supply whatever they may think is a good reason for supposing that there is some kind of rule written in Heaven (about which, more in a moment!) as to why "one size fits all" in terms of fulfilling sexual relationships. As you quite rightly point out, it is one thing not to abjure any kind of relationship that amounts to abuse or coersion, and quite another to lump in with these any sort of relationship that deviates from the social norm of a single partner.

Nor can it even be said that single-partner relationships are a norm that is or has been always realized in human societies, even if it is endorsed in most (but not all) cultures. Were that the case, prostitution would not be, as the saying goes, the world's oldest profession, and polygamy would be unknown.

I rather suspect that the historical basis for the very restrictive ideal to which you refer goes back to a time when women were regarded as men's property, which is why in so many cultures the sexual fidelity of the female has been a topic of acute and intense social and legal mandates, whereas the sexual fidelity of males has been treated as a matter of indifference (or even regarded as a kind of "unmanly" aberration). This "double standard" received strong support from religious institutions, which have generally regarded sex purely instrumentally as the process required for procreation, but the pleasures of which were mostly regarded as morally corrosive.

Some will object that there are strong evolutionary advantages that accrue to societies in which both parents are deeply invested in child-raising. But, of course, these advantages speak not at all to the issue of polyamorous relationships. (Must a "swinger" not be deeply invested in her offspring? Must a society in which polyamourous relationships are widely accepted also be one in which children are too often neglected? I fail to see why! Of course, if the only way in which adequate support of children is expedited in a culture is though strong enforcement of norms of private families, then of course those who feel unfulfilled in such relationships will be forced into decisions that can have the cionsequence of putting the welfare of children at risk.) Moreover, these same considerations apply not at all to relationships not involving fertility (either from controlled fertility, infertility, or in same sex relationships not involving adoption).

Not all people prefer polyamorous relationships, of course. But I can think of no good reason why such relationships among fully consenting adults should be anathematized or demonized in the ways they often are. So I stand with you in hoping someone (else) can explain well why such relationships are regarded so negatively.

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