Fantasy is not infidelity. Fantasy is the imagination’s small private theatre, and most adults have one. The question that quietly runs through many long marriages is not whether to have fantasies but whether to tell the partner about them - and if so, what to tell, and to what end. A patient walk through the unstable middle ground, drawing on conversations with couples who have navigated it well and a smaller number who have not.
What does the literature say about fantasy in long-term partnerships?
Empirically: the prevalence of sexual fantasy across long-term partnerships is near-universal across age and gender, varies only modestly across cultural context, and bears almost no correlation with relationship satisfaction in either direction. The cultural framing of fantasy as a sign of dissatisfaction is not supported by data. The cultural framing of fantasy as a marker of adventurousness is also not supported. Fantasy, in the empirical record, is ambient. The interesting variable is what couples do with it.
Three patterns recur in the couples we have spoken with. Some couples keep fantasy entirely private and report no dissatisfaction with the marriage on that account. Some couples share fantasies as a routine part of intimacy and report that the sharing has deepened the connection. A third group has tried sharing and concluded, for their particular marriage, that the experiment did not work and have returned to private fantasy without resentment. All three groups can be functional. None of them is structurally healthier than the others.
When does fantasy become a problem?
Three conditions, all of which can be named and watched for.
- When the fantasy substitutes for engagement with the partner. A fantasy that the partner does not know about is not a problem; a fantasy that the fantasising partner is using to replace the actual relationship tends to surface as withdrawal - emotional, sexual, eventually domestic. The symptom is the withdrawal, not the fantasy.
- When the fantasy involves a specific named real person known to both partners. The fantasy in this case is rarely just a fantasy; it is the imagination rehearsing a possible reality. Couples who have navigated this well usually report that the rehearsal was, on some level, a request the partner did not yet have words for.
- When the disclosure is itself a weapon. Some disclosures of fantasy in a marriage are made to be hurtful rather than to be intimate. The recipient knows the difference, even if they cannot name it for weeks. Counsellors we have spoken with describe this as the most damaging variant - worse than the silent fantasy, worse than the kindly-shared fantasy.
What should you tell, and what should you not?
The principle the counsellors come back to: tell what you would want told to you. Most adults do not want a granular inventory of the partner’s fantasy life. Most adults do want to know whether the partner’s imagination is, broadly, still in the marriage or has moved out of it. The useful disclosure is the higher-altitude kind - “I have noticed I think about other people sometimes” rather than the specific casting list. The latter is too much detail; the former is the right amount.
The companion piece on sex in a long marriage traces the related ground of what couples do say to each other in the long arc of a marriage that has not been actively sexed for years. The conversation about fantasy is sometimes the doorway into that larger conversation, and sometimes a side-step that postpones it.
What about the partner who does not have fantasies?
Reports of an absence of sexual fantasy in long-term partnerships do exist in the literature. They are uncommon but not pathological. The partner who does not have an active fantasy life often experiences the partner’s disclosures as confusing rather than threatening - ‘why is this in your head’ rather than ‘why are you telling me’. Couples in this asymmetric arrangement often function well, provided the lower-fantasy partner is not asked to participate in the fantasy life as a kind of audience.
Fidelity is not the absence of fantasy. It is what we do with it.
What if you are in the conversation now?
Slow it down. Do not have the conversation in bed, late at night, after wine. Do not have it in the week after a fight. Have it on a quiet afternoon, in the kitchen, in clothes, with the deliberate decision that the conversation is about the shape of the marriage rather than about any specific fantasy content. If the conversation will not take in the kitchen, a short round of structured matrimonial mediation with an empanelled counsellor on the Partlee panel will hold it in a room with the weight it needs.
“Fidelity is not the absence of fantasy. It is what we do with it.”