Monogamy by Choice, and Why the Default Is Not the Same Thing

This completes a set of three essays about arrangements, and it is the one most readers actually live inside, which is why it is last rather than first: it needed the other two to be sayable.

Here is the observation the whole piece rests on. Almost nobody chooses monogamy. Almost everybody arrives in it, because it is what the surrounding world assumes, and an assumption absorbed is not a decision made.

That distinction sounds academic until something tests it. A default has no terms, no reasons and no history of having been discussed, so when it is put under strain the couple discovers that they never agreed on anything — they merely both failed to raise an alternative. A decision has terms and reasons, and the reasons can be consulted.

What follows is not an argument for monogamy or against it. It is an argument that the version most people have is a weaker object than they think, and that the stronger version is available to them at the cost of one difficult conversation.

Start with a fact about Japan that surprises most Japanese readers, because it is not taught and it is only about a century and a quarter old.

Legal monogamy in Japan is a Meiji import. Under the early Meiji legal code of 1870, a concubine held a recognised status in law — a position within the household with a defined relationship to it. The Meiji Civil Code, enacted at the end of the century, removed that status and established the monogamous household as the legal form.

The reason was not a change of heart about desire. It was a state assembling a modern legal order that Western powers would recognise, in a period when Japan was revising its codes with the unequal treaties in view. Monogamy arrived here in the same shipment as the modern corporation and the modern prison.

The practical arrangement did not disappear when the legal status did; it simply went unrecorded, which is a pattern this chamber has now seen in three different countries. The Philippines essay found unrecorded separation where divorce was forbidden. The open-arrangements essay found unnegotiated second partners where the vocabulary was missing. Here it is again: remove a legal category and the behaviour continues without one.

The point is not that Japan is hypocritical. It is that monogamy in Japan is a legal and administrative fact of the 1890s, not an ancient inheritance, and a person who treats it as a timeless given is defending something younger than the railway.

Two arguments circulate and neither one works, which is worth establishing before going further because they consume most of the available oxygen.

The first says monogamy is natural: pair bonding is in the species, and deviation is a modern decadence. The cross-cultural ethnographic record does not support the strong version. A majority of the human societies documented in the standard anthropological surveys permitted some form of plural marriage, even though most individuals within them lived monogamously in practice, usually for economic reasons.

The second says monogamy is unnatural: humans are not built for it, the modern expectation is a cage, and honesty means admitting it. This does the same thing in the other direction, and it also fails, because the same ethnographic record shows durable pair bonding as a real and widespread human pattern rather than an invention.

Both arguments make the same move, which is to settle a question about what people want by appealing to what people supposedly are. That move does not work for anything else we care about either. Nothing follows about whether you should be monogamous from what our ancestors did, any more than anything follows about whether you should read from the fact that literacy is recent.

The honest position is that the human range is wide, that several arrangements are demonstrably liveable, and that the question of which one suits you is therefore an actual question rather than one biology has already answered.

Now the substance. What is actually wrong with inheriting monogamy rather than choosing it, given that the behaviour looks identical from outside?

The first cost is that it has no terms. The previous essay in this set made this point about non-monogamy and it applies with more force here, because the default version is so widespread that nobody notices the absence. What counts as a breach? A private message thread? An emotional intimacy at work? A second partner of the kind Japanese media discusses openly? A fantasy? Almost no couple has said. So when something happens near the line, there is no line to consult — only a retrospective argument between two frightened people about what the line always was.

The second cost is that it has no reasons. Ask a couple why they are monogamous and the honest answer is usually that the question never arose. Which means that when the arrangement becomes expensive — during a long illness, a mismatch of desire, a period of distance — there is nothing to consult about why it is worth the cost. A decision can be revisited. A default can only be broken.

The third cost is the one that does the quiet damage. An unchosen arrangement cannot be offered as a gift. If you never decided, then your fidelity is not something you are giving your partner; it is just the absence of anything else having happened. Many people feel the difference without being able to name it — the sense that being faithful has not been noticed, because there was nothing to notice.

None of this means the default relationships are bad. Most of them are fine, for years, precisely because nothing tests them. The claim is narrower: they are more fragile than they look, and the fragility is invisible until it is load-bearing.

The stronger version is unglamorous and consists of about four things.

Naming the terms. Not a vow, which is a performance for an audience, but a description: what we are agreeing to, specifically, including the edge cases that feel awkward to raise. Awkward to raise is the marker of the ones that matter; the comfortable ones were already understood.

Naming the reasons. Why this, for us. Because we want depth rather than range. Because we are each other’s person. Because one of us could not tolerate the alternative and the other would rather have this person than that freedom — which is a legitimate reason and is more honest than most vows.

Agreeing to revisit. Not because anything is wrong, but on the same principle the open-arrangement essay set out: terms that were right in year one are frequently wrong in year twelve, and the couples who last treat the agreement as a living document. A monogamous couple who have never once revisited their agreement have a twelve-year-old contract signed by two people who no longer exist.

And the hardest one: agreeing that attraction to other people is not a breach. It occurs. It occurs in everybody, it occurs in happy marriages, and a couple who have implicitly agreed that it does not occur have committed themselves to concealing something universal from each other. That concealment is much more corrosive than the attraction, and it is entirely produced by a term nobody stated.

Monogamy is often defended on grounds that are either moral or fearful, and both defences are weak. Here is the argument we think is actually strong, and it is not about exclusivity at all.

The value of a long monogamous relationship is continuity: being known over time by somebody who stays.

Consider what this chamber has established elsewhere. The essay on mobility found long-term nomads reporting a specific loneliness that was not a shortage of company — they had company constantly — but an absence of anybody who had known them for eleven years. The essay on synthetic companions found a patient, endlessly available presence that could not offer being chosen by something with alternatives, and had no shared history to draw on. The expectation-gap essay found people evaluating each other indefinitely and never arriving anywhere.

What monogamy over time produces, when it works, is a person who remembers who you were before, who has seen you at your least presentable and stayed, and in front of whom you do not have to establish yourself from the beginning. That is not available in a series of four-month relationships, however good each one was. It is not available from a machine. And it is not produced by exclusivity as such — it is produced by duration, and exclusivity is one arrangement that makes duration likely.

Notice what that argument does not say. It does not say the alternatives are shallow; a long-term polyamorous relationship accumulates the same continuity. It says the good thing is the continuity, and that a person defending monogamy should defend that rather than defending a rule.

Three strains recur, and they are worth naming because a couple who have chosen can plan for them and a couple who defaulted cannot.

Desire discrepancy. Two people wanting different amounts at different times is the ordinary condition of two nervous systems, and this chamber has said so repeatedly. A default arrangement treats it as a symptom that something is wrong. A chosen one can treat it as a fact to be negotiated, which is the only thing that has ever helped.

Attraction to somebody else. Handled above: it is not a breach unless a stated term makes it one, and almost no stated term does.

Duration itself. The novelty that carried the first years is a finite resource, and no arrangement renews it. What replaces it is either deliberate attention or nothing, and the couples for whom it becomes nothing frequently conclude that they chose wrong, when what actually happened is that they stopped doing the thing and never noticed there was a thing to do.

All three are more survivable with terms than without them, which is the whole practical claim of this essay.

We think monogamy is an excellent arrangement for a large number of people and a poor one for some, and that this is unremarkable — the same is true of every arrangement in this set.

What we think is worth saying is that the version most people have is not the strong version. It is an inheritance from a legal reform of the 1890s, absorbed without examination, held without terms and defended with an argument from nature that does not work.

The strong version is available and costs one conversation. It is not a conversation about whether to open anything. It is a conversation in which two people who are going to be monogamous anyway say out loud that they are choosing it, name what it includes, say why, and agree to look at it again. Almost nobody has had it. It converts a default into a gift, and a gift can be received, which a default cannot.

And the reason to want it has nothing to do with virtue. It is that the thing which makes a long relationship worth the cost — being known over years by somebody who stayed — is produced by duration, and duration survives strain much better when there are terms to consult than when there is only an assumption that nobody ever said out loud.

You do not owe tradition obedience. You do not owe modernity performance. You are allowed to discover what actually fits your life.

Two, and the first runs against this chamber’s own grain.

Do not read this set of three essays as a progression from restrictive to enlightened. They are not a ladder. The open-arrangements essay argued that those arrangements demand more skill, not less; this one argues that monogamy chosen is stronger than monogamy assumed. Neither is a destination and neither is a starting point.

And do not use the Meiji history as a debunking. That legal monogamy here is about 130 years old undermines the claim that it is a timeless inheritance; it does not undermine the arrangement. A great many valuable things are recent. The historical fact is useful only against the specific argument that monogamy needs no justification because it has always been so, which is the argument that has kept most couples from ever having the conversation.

The Japanese legal chronology — a recognised status for a concubine under the early Meiji code of 1870, removed by the Meiji Civil Code enacted at the end of the century — is stated from memory and should be verified against the statutes and legal-history scholarship before this piece is marked fact-checked. The characterisation of treaty revision as a motive is the standard historical account and is nonetheless an interpretation of motive.

The cross-cultural claim that a majority of documented societies permitted some form of plural marriage while most individuals within them lived monogamously comes from the standard anthropological survey databases. Those databases have known sampling and coding limitations, describe societies at the time of documentation rather than timelessly, and should not be treated as a survey of humanity.

The four practices of a chosen arrangement are drawn from counselling literature and from the practitioner accounts used in the open-arrangements essay. They are a convergent account, not a validated instrument, and no outcome claim is attached to them.

The continuity argument is a philosophical position rather than an empirical finding. Relationship-satisfaction research does not straightforwardly establish it, and a reader is entitled to value other things about a partnership more.

And the essay claims nothing about how many couples have or have not had the conversation it recommends. That almost nobody has is an impression from practitioner accounts and from ordinary observation, not a measurement.

Three essays, three arrangements, and the same finding underneath all of them.

Not which structure is correct. What decides how an intimate life goes is whether two people can say to each other, while nothing is wrong, what they are actually agreeing to — and then say it again some years later when they have both changed.

That conversation is a skill and not a virtue. It is frightening in direct proportion to how much is at stake, which is why almost nobody attempts it inside the relationship where it matters most, and why the first attempt usually happens at the moment it has already become an emergency.

That is what an evening with Moonlight is: unhurried time in which stating what you want and naming what you will not accept is the activity rather than the risk, where the terms are yours and set in advance, where a boundary is part of the conversation, and where nothing is inferred from your silence. It is not about your marriage and it is not advice about it. It is practice at the one sentence that every arrangement in these three essays — including the most conventional one, including yours — turns out to depend on.