Why Desire Often Changes—Even in Loving Relationships
How Intimacy Evolves Through Every Stage of Life
You love your partner. You’re committed. And yet somewhere along the way, the desire you once felt—that pull toward each other that used to feel almost effortless—has shifted. Maybe it comes and goes. Maybe one of you wants more intimacy than the other. Maybe you’ve started to wonder if something is wrong.
The answer, in most cases, is: nothing is wrong. Desire shifts across the lifespan, just as so many aspects of our emotional and physiological lives do. What makes it particularly painful in relationships is when that shift gets pathologized—when one or both partners begins to take it personally, or to read it as a sign that something is broken, rather than recognizing it as a predictable feature of long-term intimacy. In our work as couple therapists in Ottawa, intimacy issues like this are among the most common—and most treatable—concerns we see.
Desire Is Not a Fixed Thing
We tend to think of desire as something we either have or don’t—like a light switch. But research and clinical experience tell a different story. Desire is dynamic. It responds to our stress levels, our health, our emotional safety, our life stage, and the quality of connection we feel with our partner on any given day.
Esther Perel, one of the world’s most influential voices on long-term desire, has written extensively about how sexuality is not a fixed destination but an evolving, lifelong experience. In her seminal book Mating in Captivity, she challenges the idea that desire naturally belongs only to the early stages of a relationship. As our bodies change across the lifespan—through stress, hormonal shifts, aging, parenthood, illness, and the simple accumulation of years—so too does the shape of our desire. Perel’s work invites couples to expand their definition of intimacy and eroticism rather than measure their current experience against who they were at twenty-five. Desire, she suggests, can be continually reinvented—if couples are willing to stay curious about each other and about themselves.
Sex therapist Emily Nagoski, in her widely cited work, describes two systems that govern desire: an accelerator and a brake. The accelerator responds to things that feel good, safe, and connecting. The brake responds to stress, distraction, unresolved conflict, and feeling emotionally distant. In long-term relationships, the brake often gets more traffic than the accelerator—not because love has faded, but because life has gotten louder.
When Partners Are on Different Pages
One of the most painful dynamics couples face is desire discrepancy—when one partner wants more physical or sexual intimacy than the other. Sometimes called mismatched libido or different sex drives, this is not a sign of incompatibility or rejection. Studies suggest it is actually the norm in long-term partnerships, not the exception.
AASECT-certified sex therapist Martha Kauppi, founder of the Institute for Relational Intimacy and one of the leading clinical voices on desire discrepancy, points to a concept she calls meaning-making as one of the central drivers of suffering in these situations. When desire is mismatched, both partners tend to construct painful narratives about what it means. The higher-desire partner may conclude they are unattractive or unwanted. The lower-desire partner may decide they are broken, a bad partner, or unfair. Kauppi is clear that these narratives, however understandable, are not the truth. They are stories built in the absence of open conversation—and they tend to do far more damage than the desire gap itself.
But here’s where things get complicated: over time, desire discrepancy can take on a painful relational meaning that goes far beyond sex. The higher-desire partner may begin to feel unwanted, invisible, or like they’re chasing something that keeps moving away. The lower-desire partner may feel pressured, guilty, or like their body has become a source of conflict. Both partners end up feeling alone in different ways.
This is a relational dynamic, not a personal failing. And it requires a relational response.
What’s Really Driving the Gap?
When couples come to relationship therapy struggling with desire discrepancy, the presenting issue is rarely the whole story. Low sexual desire or a gradual loss of desire in a long-term relationship can have many contributing factors beneath the surface:
• Unresolved tension or conflict that has never been fully repaired
• One or both partners feeling emotionally disconnected or unseen
• Stress from work, parenting, finances, or health that has slowly eroded closeness
• A gradual drift from being each other’s priority into being co-managers of a shared life
• Shame or anxiety around intimacy that has gone unspoken
Desire, it turns out, is deeply relational. It tends to flourish in an environment of emotional safety, genuine curiosity about each other, and the sense that you are truly seen by your partner. When those conditions erode—even subtly—desire often follows.
Rebuilding Closeness: The PACT Perspective
The Psychobiological Approach to Couple Therapy (PACT), developed by Dr. Stan Tatkin, offers some practical and research-informed ways for couples to rebuild closeness—and desire often follows. It is one of the core frameworks our couple therapists in Ottawa draw on when working with intimacy and desire.
One of the core PACT principles is that couples need to actively and consistently prioritize each other and the relationship—not just on special occasions, but every day. This can look surprisingly simple: a genuine expression of appreciation, a moment of acknowledgment, a small gesture that says “I see you.” Over time, these daily deposits build a reservoir of goodwill and connection that sustains the relationship through harder stretches.
PACT also encourages couples to develop rituals around what might be called launching and landing—the moments at the beginning and end of each day when partners transition toward and away from each other. A meaningful goodbye in the morning and a genuine reconnection in the evening, however brief, signal to each partner’s nervous system that the relationship is a safe and reliable home base. These rituals, repeated consistently, create a rhythm of connection that couples can return to even when life feels overwhelming.
Beyond daily rituals, PACT invites couples to set aside dedicated time for the relationship itself—time that is just the two of you, engaged in something you both enjoy. A shared walk, a hobby, caring for a pet together, cooking a meal. The activity matters less than the quality of joint attention it creates. When partners share a focus and an experience, they are reminded of what drew them together in the first place.
PACT also places significant emphasis on co-regulation—the idea that our nervous systems are deeply influenced by those we are close to. When couples engage in simple physical practices like eye gazing, hand holding, long hugs, or gentle touch, something real happens at a biological level. These moments of connection help calm each partner’s nervous system and actually synchronize them with each other. Close eye contact, in particular, triggers the release of oxytocin—often called the bonding hormone—which promotes feelings of warmth, trust, and closeness.
Finally, PACT encourages couples to stay curious about each other. No matter how long you have been together, your partner is not a finished story. People change—their desires, their fears, their bodies, their needs. Couples who make space for open, non-judgmental conversations about intimacy and sexuality—who can say “I’ve been thinking about this” or “I’d love to know more about what feels good for you now”—are not just maintaining connection. They are actively building it.
None of this requires a grand romantic gesture. It requires intention. Choosing to reach for your partner’s hand. Sitting close. Looking at each other—really looking—without an agenda. These small, repeated moments of connection are what securely functioning couples are made of, and they create the conditions in which desire can quietly return.
Let Changing Desire Transform Your Connection
Desire discrepancy is common, it’s manageable, and couples work through it every day—with the right support. It rarely resolves on its own, though. Left unaddressed, the gap tends to widen, and the story each partner tells about what it means gets more entrenched. Whether you are looking for couple therapy or sex therapy in Ottawa, or simply searching for a couple therapist near you, finding the right support is the most important first step.
At the Authentic Life, our couple therapists bring deep expertise in the full spectrum of relational intimacy — including the ways desire shifts, evolves, and can be rediscovered across the lifespan. They have the knowledge, the clinical skill, and the experience to help you and your partner make new meaning together around this most personal aspect of your relationship.
We invite you to book a complimentary discovery call with one of our couple therapists. It’s a no-pressure conversation to explore whether we’re the right fit for you and your partner—and to take a first step toward feeling more connected. Book your free discovery call here.
The Authentic Life offers couples therapy and sex therapy in Ottawa, helping partners move from disconnection to genuine closeness. Our experienced therapists provide personalized support for desire discrepancy, intimacy issues, and the relationship challenges that arise across the lifespan.