A warm, honest look at what actually happens to sexual desire in long-term relationships
— and what you can do about it.
Sarah and Daniel had been together for eleven years. They met at a mutual friend’s birthday party, got engaged at the top of the CN Tower on a dare, and had spent the last decade building something genuinely lovely — a house, two kids, a shared love for Sunday farmer’s markets at Dufferin Grove. By most measures, they were great. They laughed a lot. They were kind to each other. They actually liked each other.
But they weren’t sleeping together anymore. Not really. Maybe once a month, if a birthday or anniversary made it feel obligatory. And neither of them knew how to say out loud what they were both privately terrified about: that the desire had quietly packed its bags and left, sometime between the second kid and the new mortgage. That the love was absolutely still there — but the wanting wasn’t.
If this sounds familiar, here’s what I want you to know before we go any further: you are not broken. Neither is your relationship. What you’re experiencing is one of the most common — and most poorly understood — things that happens in long-term love.
The Short Answer
Sexual desire fades in long-term relationships primarily because the brain shifts from novelty-driven neurochemistry to bonding chemistry — and because the emotional and practical weight of shared life often suppresses the conditions desire needs to emerge. This does not mean the relationship is failing. With the right understanding and support, desire can absolutely be rebuilt and sustained. It just works differently than it did in year one.
Who This Post Is For
This is for the couple who loves each other deeply but hasn’t had sex in months (or longer) and doesn’t know how to talk about it. It’s for the person who lies awake wondering if they’re still attracted to their partner, or whether something is fundamentally wrong with them. It’s also for the partner who keeps initiating and keeps getting a gentle no — and who is running out of ways to not take it personally.
Your Brain in Love: The Neuroscience Nobody Warned You About
In the early months of a relationship, your brain is essentially running on a cocktail of dopamine, norepinephrine, and phenylethylamine — the neurochemicals of obsession, novelty, and anticipation. This is why new love feels like a low-grade fever. You notice everything about them. You replay conversations. You’re aroused almost on demand. It feels effortless because your nervous system is doing a lot of heavy lifting on your behalf.
But here’s the thing: this state has a shelf life. Neurologically, it was never designed to last. The brain’s reward system simply cannot maintain that level of activation indefinitely — it would be exhausting and unsustainable. As a relationship matures, a different chemistry gradually takes over: oxytocin and vasopressin, the hormones of bonding, trust, and deep attachment. This is the chemistry of long-term love. It is warmer, steadier, and profoundly meaningful. It just doesn’t produce the same electric urgency as the early days.
The trouble is that most of us were never taught this shift was coming. So when desire dips, we panic. We read it as a signal that something has gone wrong, when in fact it’s evidence that something went right — your relationship deepened into something real.
What Is Sexual Desire, Actually?
Sexual desire is best understood not as a fixed drive you either have or don’t have, but as a responsive system shaped by psychological, relational, hormonal, and contextual factors. Sex researcher Emily Nagoski describes it as operating through two competing systems: an accelerator that responds to cues signalling “sex is welcome here,” and a brake system that responds to anything that signals caution, threat, or simply “not now.” Understanding which system is dominant for you — and why — is often the most useful first step.
The Paradox Esther Perel Names
Relationship therapist Esther Perel has spent decades exploring a paradox that sits at the heart of long-term intimacy: the very qualities that make a relationship feel safe — closeness, familiarity, predictability, emotional merger — are often the same qualities that suffocate erotic desire.
As she puts it: the very elements that nurture love — reciprocity, closeness, emotional security — are sometimes the very things that stifle desire.
Desire, Perel argues, thrives on a certain degree of otherness. On the sense that your partner is a separate person you reach across a distance to meet. When two people become so merged — co-managing a household, parenting as a unit, completing each other’s sentences — the erotic can lose its footing. The person who used to feel excitingly separate now just feels like… family.
This is not a criticism of closeness. It’s a map for understanding why intimacy and eroticism require active, ongoing tending if both are going to coexist in the same relationship.
“Desire needs air. It needs mystery. It lives in the space between two people, not in the merger.”
— Esther Perel
You’re Not Alone — The Numbers on Low Desire in Canada
A national study of 2,400 Canadian adults aged 40 to 59 found that low sexual desire was the most commonly reported sexual concern — experienced by 40% of women and about one-third of men. Importantly, researchers noted a direct correlation between low desire and being in a long-term relationship.
This isn’t a coincidence or a personal failing. It’s a pattern that shows up consistently across research, cultures, and relationship types. Low desire doesn’t mean no love. It often means the conditions for desire haven’t been tended to — and that is something that can change.
The Brakes Are Probably On
Using Nagoski’s accelerator-brake model, most long-term couples don’t have a broken accelerator. They have too much weight on the brakes. Common brake-pressers include:
Unresolved resentment or emotional distance. If there’s tension that hasn’t been repaired, or if one partner has been feeling unseen or unappreciated, the body often just quietly opts out of intimacy. It’s not personal. It’s protective.
The mental load. The invisible labour of managing a household, a family, or a packed life is exhausting in ways that are hard to quantify. By the end of the day, many people have nothing left. The body wants rest, not arousal.
Stress and nervous system activation. Cortisol, the stress hormone, directly suppresses sexual desire. When you’re in a constant low-grade survival mode — deadlines, school pickups, financial pressure — desire doesn’t get prioritized. The body knows what’s urgent.
Body image and shame. It’s very hard to feel desirable when you’re at war with your own body. Postpartum changes, aging, weight fluctuations, chronic illness — all of these can quietly close down access to pleasure and desire.
Medication and hormonal changes. Many commonly prescribed antidepressants significantly reduce sexual desire. Perimenopause, menopause, and hormonal shifts post-pregnancy all affect the hormonal landscape of desire. These are medical realities, not character flaws.
A Note on Neurodivergence and Desire
At Horizon, we work with many neurodivergent individuals and couples — those living with ADHD, autism, or AuDHD — and desire in these relationships often has its own particular shape.
For people with ADHD, desire tends to be intensity-driven and highly responsive to novelty. Early relationship energy can be almost intoxicatingly activating. But as a relationship becomes more familiar, that dopamine fuel fades, and what looked like high desire can seemingly disappear. This isn’t a loss of love. It’s the ADHD brain doing what it does.
For autistic individuals, desire may be deeply context-dependent — tied to sensory comfort, predictability, and explicit communication rather than the ambient, unspoken cues that many neurotypical relationships rely on. When those conditions aren’t present, desire may not show up — not because it doesn’t exist, but because the environment isn’t set up for it. Understanding this can transform the dynamic entirely.
What Actually Helps: Practical Starting Points
If desire has faded in your relationship, here are some things worth exploring — both on your own and ideally together:
Get curious, not critical. Instead of asking “Why don’t I want this anymore?” try “What conditions would make wanting feel possible?” This shifts you from shame into inquiry, which is a much more useful place to work from.
Reduce the brakes before you try to hit the accelerator. Attempting to generate desire while you’re exhausted, resentful, or stressed rarely works. Start with what’s pressing the brakes — and address that first.
Rebuild non-sexual physical intimacy. When sex has become loaded with expectation, even a hug can feel like an invitation that has to be accepted or declined. Returning to affectionate, non-goal-oriented touch — a hand on the shoulder, sitting close, a real kiss that doesn’t lead anywhere — can gradually restore physical ease.
Have the actual conversation. Not in the bedroom, not in the heat of a rejected initiation, but somewhere calm and neutral — maybe over coffee at your favourite spot on Yonge Street. Something like: “I’ve been feeling disconnected from us intimately, and I miss you. I don’t want this to keep being a thing we don’t talk about.” It doesn’t have to be perfect. It just has to be honest.
Read the book. Emily Nagoski’s Come As You Are is one of the most practically useful books written on desire, and it’s accessible to everyone regardless of gender. It’s a genuine game-changer for many couples.
Consider sex therapy. Not because something is broken, but because navigating desire together is genuinely complex work, and having a skilled, non-judgmental professional in the room makes a real difference.
If you’re also navigating broader relationship communication challenges alongside the intimacy piece, you might find our guide to couples therapy in Toronto helpful as a companion read.
10 Questions People Are Too Afraid to Google
Yes — extremely normal. Desire naturally shifts in long-term relationships as the brain’s neurochemistry changes from novelty-driven arousal to bonding and attachment. The presence of love and the presence of desire are governed by different systems, and they don’t always move in sync.
Not necessarily. Attraction and desire are related but not identical. Many people who experience low desire still feel genuine attraction to their partner — they’re just not accessing that pull consistently. Often the culprit is stress, exhaustion, unresolved emotional distance, or hormonal factors rather than a fundamental shift in attraction.
Neither of you is wrong. Desire naturally varies between people and across time. What matters is whether the discrepancy is being navigated with care, honesty, and mutual respect — or whether it’s becoming a source of shame, pressure, and distance. The latter is what sex therapy helps address.
Timing and framing matter enormously. Choose a calm, neutral moment — not the bedroom, not after a rejection. Lead with connection rather than complaint: “I’ve been missing closeness with you” lands very differently than “we never have sex anymore.” Go in with genuine curiosity about their experience, not just your own frustration.
In many cases, yes. Desire is not a fixed thing — it’s a dynamic system that responds to conditions. When the conditions that suppressed it are addressed — stress, resentment, disconnection, shame, unmet needs — desire can re-emerge. It may look different than it did at 25, but different doesn’t mean worse.
Completely okay — this is called responsive desire, and it’s a valid and common way that desire works, particularly in long-term relationships. You don’t need to feel desire before initiating. Desire can arise in response to intimacy, touch, and connection that’s already underway. Knowing this can relieve an enormous amount of pressure.
Yes, and you’re not alone in this. Many people reach a point where they’ve been performing desire they don’t feel for so long that they’ve lost track of what genuine desire even feels like for them. Sex therapy creates a space to slow down and get reacquainted with your own experience — honestly and without judgment — and to gradually rebuild a more authentic intimate life.
This is one of the most common and most painful situations couples face. If your partner isn’t ready to come to therapy, individual sex therapy can still be enormously valuable for you. It helps you understand your own experience, clarify what you need, and develop more effective ways of communicating about intimacy. Sometimes one person’s work creates enough shift in the dynamic that the other partner gradually becomes more open.
Not inevitably. While hormonal shifts and health changes do affect desire for many people as they age, research is clear that satisfying sexual intimacy is absolutely possible well into older adulthood. A national Canadian survey found that most midlife Canadians reported genuinely satisfying intimate lives, with many saying they were actually more adventurous than in their younger years. Relationship quality and emotional connection matter far more than age.
Sex therapy is for exactly your situation. The idea that you need to be in crisis to seek support is a bit like waiting until you have a serious injury before seeing a physiotherapist. Many couples come to sex therapy not because something is broken, but because they want their intimate life to be better than it currently is. That is a completely worthy reason to seek support.
Ready to Talk?
If what you’ve read here feels familiar, we’d love to connect. At Horizon Therapy, our sex therapy in Toronto is offered in a warm, judgment-free space — for individuals and couples navigating desire, intimacy, and everything that gets in the way. We work with clients in person at our Midtown location near Yonge and St. Clair, and online across Ontario.
You don’t need to have a specific diagnosis. You don’t need to have reached a crisis point. You just need to want something different than what you have now — and the willingness to start the conversation.
