When the Spark Fades: Understanding Desire Fluctuations and How Relationship Therapy  Helps

Written By Stephanie Garner

Something shifts in the majority of long-term relationships. The intensity of early desire gives way to something steadier, quieter - and for many couples, at some point, it fades further than they had expected or hoped. 

This is not a failure. It is not unique to you or your relationship. And it is rarely as simple as one partner losing interest in the other. Desire fluctuations are among the most common presenting issues in couples counselling in Bangkok and worldwide, and the reasons behind them are far more varied - and far more workable - than popular culture tends to suggest. 

This post explores what intimacy and sexual desire actually are, what causes them to shift across a relationship's lifetime, and how relationship therapy in Bangkok can support couples in rebuilding genuine connection. 

Redefining the Duo: What Are Intimacy and Sexual Desire? 

Intimacy and sexual desire are often spoken about as though they were the same thing. They are not - and understanding the distinction matters enormously in couples counselling. Intimacy is the quality of closeness between two people: the safety to be seen, the trust to be  vulnerable, the sense of being known by another person. It is built through thousands of small moments of attention, care and honest communication, and it can exist without any sexual element at all. 

Sexual desire is something more unpredictable. It is the drive towards erotic connection, and it  is highly sensitive to the conditions under which it exists. Psychotherapist and relationship expert Esther Perel, in her influential work Mating in Captivity (2006), explores what she argues is a central paradox of long-term desire: that the very qualities which build deep intimacy - security, familiarity, mutual dependence - can, over time, work against the erotic charge that originally drew partners together. Love, Perel argues, thrives on closeness and certainty. Desire tends to need a degree of mystery, separateness and space. Managing that tension, rather than expecting it to resolve itself, is often where the real work of sustaining desire in a relationship  begins. 

This is not a counsel of despair. It is an invitation to understand desire on its own terms - and to work with it thoughtfully, rather than hoping it returns on its own. 

Why the Spark Shifts: Common Triggers for Desire Fluctuations 

There is rarely a single explanation for loss of desire in couples. The triggers are various, often  interconnected, and sometimes operate over a long period before either partner becomes consciously aware of what has changed. 

Stress and mental health  

A sustained increase in work pressure, financial anxiety, family demands or unresolved grief can significantly diminish sexual desire. When the nervous system is in a prolonged state of stress, the body prioritises survival over intimacy. This is a physiological response, not a personal choice. 

Physical health and medication  

A number of medical conditions, including thyroid dysfunction, hormonal changes, chronic pain and depression, are directly associated with low libido in relationships. Many commonly prescribed medications, including SSRIs and some hormonal contraceptives, also carry libido reduction as a recognised side effect. Where desire has shifted alongside a change in health status or medication, it is worth discussing with a GP or relevant specialist. 

Life transitions  

Parenthood, in particular, is a profound reorganiser of couples' erotic lives. Sleep deprivation, shifting roles within the household and the redistribution of emotional labour all affect desire. So do other significant transitions: ageing, career change, relocation and bereavement. Any period of sustained change tends to redirect emotional and physical resources inward, often at the cost of erotic connection.

Communication breakdown and resentment  

Unspoken resentment and unresolved conflict are among the most consistent inhibitors of desire. When partners feel unheard, unsupported or dismissed in the day-to-day fabric of their relationship, the willingness to be vulnerable in an erotic context contracts accordingly. Desire lives downstream of trust. 

Mismatched desires and expectations  

It is common for partners to discover, over time, that their sexual interests, preferred frequency or erotic styles differ more than they initially realised. Without a framework for navigating those differences openly, the gap tends to widen rather than close. 

Intimacy Beyond the Binary: Fluctuations in LGBTQI+ Partnerships 

Desire fluctuations are not specific to heterosexual or cisgender couples, but LGBTQI+  partnerships can face particular pressures that directly affect intimacy and erotic connection. 

Minority stress - the chronic pressure associated with navigating a world that does not always accept or affirm one's identity - carries a significant cumulative effect on mental health and, by extension, on desire and relational closeness. Research by Ilan Meyer, published in Psychological Bulletin (2003), established that LGBTQI+ individuals face a specific set of stressors, including experiences of discrimination, the need for identity concealment and internalised stigma, which are associated with elevated rates of anxiety and depression. Both of these conditions are closely linked to changes in libido and emotional intimacy. 

For couples where one or both partners are trans or non-binary, gender transition can be a period of significant renegotiation around desire, body image and erotic identity. This does not mean that desire cannot flourish during or after transition - it frequently does - but it may need to be consciously re-explored and rearticulated as each partner's relationship with their own body  and sense of self evolves. 

Same-sex couples also navigate relational territories that different-sex couples may not encounter, including the absence of inherited cultural scripts for relationship structure, long-term partnership, family formation and ageing together. This freedom can be genuinely liberating, but it can also leave couples without external frameworks for navigating intimacy challenges, which makes the support of an affirming therapist all the more valuable.

Managing the Shift in Alternative Structures: Polyamory and CNM 

For those in polyamorous or consensually non-monogamous (CNM) relationships, desire fluctuations take on additional complexity - and additional texture. 

New relationship energy (NRE), the state of heightened excitement and intensified desire that tends to characterise the early stages of a new connection, is a well-recognised phenomenon in CNM communities. Its presence in one relationship can create a noticeable contrast with the steadier, more settled quality of desire in a longer-term partnership, and managing that contrast with honesty and care is an important part of CNM practice. 

As explored in Unicorn Care's posts on jealousy and CNM and polysaturation, CNM relationships call for a sustained commitment to communication and self-awareness. When one partner is experiencing a period of heightened desire connected to a newer relationship while another is experiencing lower desire overall, that asymmetry needs to be navigated with particular sensitivity - and without the assumption that one partner's experience invalidates the other's. 

Conversely, the explicit frameworks for consent, communication and boundary-setting that many CNM practitioners develop can offer all partners useful tools for exploring and articulating desires that couples in more conventional structures have not always been encouraged to develop. A sex positive couples therapist who genuinely understands these dynamics is well placed to support that work. 

The Vulnerability Gap: How Emotional Distance Manifests Physically 

One of the most consistent findings in relationship research is the close connection between  emotional intimacy and physical desire. When emotional distance grows in a partnership - whether through disconnection, unresolved conflict, grief or simply the accumulating weight of busy, separate lives - it tends to manifest as reduced physical closeness. 

Attachment theory, developed by John Bowlby and extensively applied to adult romantic relationships by researcher Sue Johnson, offers a compelling framework for understanding this pattern. Johnson's work, detailed in Hold Me Tight (2008) and underpinning her widely practised Emotionally Focused Therapy (EFT), demonstrates that adult partners are deeply wired for secure connection and that emotional insecurity - the felt sense that one's partner is not reliably available or responsive - generates anxiety which inhibits both emotional and sexual closeness. 

In practice, this means that couples presenting with intimacy issues often benefit not from focusing directly on the sexual dimension of their relationship, but from addressing the emotional withdrawal, disconnection or negative cycles that sit beneath it. This is precisely the work that skilled couples counselling makes possible. 

Perel's framing adds a further layer. She identifies two different fears that can inhibit desire in long-term relationships: the fear of loss, which leads partners to hold on tightly in ways that inadvertently reduce the space desire needs to breathe; and the fear of abandonment, which can generate a kind of clinging that paradoxically pushes intimacy further away. Both speak to the vulnerability that underlies what can appear, on the surface, to be a simple absence of desire. 

Beyond "Fixing It": How Couples Counselling Actually Helps 

Searching for how to fix intimacy issues is a natural response when the loss of desire in a relationship feels urgent or painful. The framing is understandable. But it tends to lead couples towards performance-focused approaches or the pressure to restore some earlier version of the relationship that may no longer exist - and may not, in any case, be what either partner actually wants now. 

Couples counselling in Bangkok works differently. It does not aim to recreate a past state. It aims to help partners understand what has shifted, why, and what both of them genuinely want from their relationship as the people they are today. 

In practice, this might involve identifying the negative interactional cycles that have built up between partners and interrupting them before they cause further damage; creating safer conditions for honest conversation about sexual needs, desires and anxieties; working through the resentment or grief that has accumulated around intimacy; exploring whether there are mismatched expectations that need to be openly acknowledged and renegotiated; or developing a shared understanding of what connection means for each person, which may differ considerably from what it meant at the start of the relationship.

Marriage counselling in Bangkok, where it incorporates the full range of relational dynamics rather than narrowing to conflict resolution alone, offers couples the space to have conversations they have not been able to have on their own - not because those conversations are impossible, but because the conditions for them have not previously been available. 

Counselling for All Dynamics: Sex Positive Relationship Therapy 

A sex positive couples therapist brings a specific orientation to this work. Rather than treating sexual desire as a problem to be contained or returning it to a standardised norm, they approach it as a dimension of human experience that deserves careful, non-judgemental  exploration. 

This matters because the barriers to intimacy in couples are not always what they appear to be at the surface. A partner presenting with low libido may be carrying shame about desires they have not felt safe to name. A couple experiencing sexual mismatch may not yet have had the language or the safe context to articulate what each of them actually wants. A relationship in which desire has faded may be one in which both partners have, for years, been performing a version of their erotic selves that no longer reflects who they are. 

Sex positive therapy creates the conditions for this kind of honest exploration. It affirms the full spectrum of consensual adult sexuality, offers frameworks for understanding the genuine complexity of desire, and supports couples in making informed, self-directed choices about their relational and sexual lives. As explored in Unicorn Care's post on intimacy and sexual desire, the therapeutic space can open up conversations about connections that partners have not been able to have anywhere else. 

For couples in non-traditional relationship structures, this affirmative orientation is not optional - it is essential. A therapist who is unfamiliar with, or uncomfortable around, polyamory, kink or LGBTQI+ relationship dynamics cannot provide the genuinely supportive environment this work requires. Couples who are considering opening their relationship may find that working with a sex positive couples therapist is one of the most valuable resources available to them during that transition.

Rebuild Your Connection at Unicorn Care, Bangkok. Book a Free  Consultation 

At Unicorn Care, we offer relationship therapy in Bangkok for couples across all relationship structures: monogamous, CNM, polyamorous, LGBTQI+, and everything in between. Our approach is affirming, client-led, and grounded in the understanding that every couple's experience of desire and intimacy is entirely their own. 

Whether you are navigating loss of desire in your relationship, working through the aftermath of emotional disconnection, or simply seeking a supported space to understand each other with greater honesty and care, we are here without judgement. 

If you are unsure what type of support you need, you can still enquire. You do not need the ‘perfect’ words to begin. 

This article is general information and is not a substitute for medical advice, diagnosis, or treatment. It is based on common themes reported in counselling settings and does not rely on a single external study. 

Sources: 

  • Perel, E. (2006). Mating in Captivity: Sex, Lies and Domestic Bliss. Hodder & Stoughton.

  • Johnson, S. (2008). Hold Me Tight: Seven Conversations for a Lifetime of Love. Little,  Brown and Company. 

  • Bowlby, J. (1969). Attachment and Loss, Vol. 1: Attachment. Basic Books.

  • Meyer, I.H. (2003). Prejudice, Social Stress, and Mental Health in Lesbian, Gay, and  Bisexual Populations: Conceptual Issues and Research Evidence. Psychological  Bulletin, 129(5), 674-697.

Stephanie Garner
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The Psychology of Pop Culture Kink: Why Media Misrepresentations Matter in Sex Positive Therapy