A drop in your boyfriend’s interest in sex is rarely about you. That’s the hardest thing to believe when you’re living it, but low sexual desire in men has a long list of causes, most of them physical, psychological, or relational, and almost none of them meaning he’s no longer attracted to you. Understanding what might be going on can help you figure out the right conversation to have and whether there’s something specific to address.
Stress and Mental Health Are the Most Common Culprits
Chronic stress is one of the biggest libido killers for men, and the mechanism is straightforward: when the body stays in a stressed state, it produces elevated levels of the stress hormone cortisol. Sustained high cortisol actively suppresses the hormonal pathways that produce testosterone, the primary driver of male sex drive. Research on this hormonal interplay shows that stress-related cortisol release can repress testosterone-regulated genes, leading to measurably lower testosterone levels over time. In practical terms, a man dealing with job pressure, financial anxiety, family conflict, or any prolonged source of stress may genuinely not feel sexual desire, even toward a partner he finds deeply attractive.
Depression and anxiety work the same way, both through the stress-hormone pathway and through the emotional flattening that comes with these conditions. A man who is depressed often loses interest in activities that used to bring pleasure, and sex is no exception. He may not even recognize what’s happening, especially if he hasn’t been formally diagnosed. If your boyfriend has seemed more withdrawn, tired, or emotionally flat in general, not just in the bedroom, mental health is worth exploring.
Medications That Quietly Kill Libido
Several common medications list reduced sex drive or sexual dysfunction as side effects, and men don’t always connect the dots. The biggest offenders are antidepressants, particularly SSRIs like sertraline, citalopram, escitalopram, and fluoxetine. Up to 58% of patients on SSRIs report sexual dysfunction, which can include low desire, difficulty with arousal, and trouble reaching orgasm. The cruel irony is that the medication treating his depression may be creating a new problem in the relationship.
Hair loss medications are another surprisingly potent cause. Finasteride, the active ingredient in common hair loss treatments, has one of the strongest associations with sexual side effects of any medication studied. It works by blocking a hormone involved in hair loss, but that same hormone plays a role in sexual function. Some men experience persistent effects even after stopping the drug.
Blood pressure medications (especially older beta-blockers like propranolol), anti-anxiety drugs, mood stabilizers, gabapentin, and even opioid pain medications can all reduce desire. If your boyfriend started or changed a medication in the months before his interest dropped, that’s a lead worth following up on with his doctor.
Low Testosterone and Other Physical Causes
Testosterone levels naturally decline with age, but “low T” can affect younger men too. Normal testosterone for adult men ranges from about 193 to 824 ng/dL, though labs vary slightly in their reference ranges. When levels fall below the normal range, reduced sex drive is one of the first and most noticeable symptoms, often alongside fatigue, difficulty concentrating, and mood changes. A simple blood test can check this.
Sleep problems are another underrated factor. Men with obstructive sleep apnea, a condition where breathing repeatedly stops during sleep, consistently show lower testosterone levels than men without it. The worse the apnea, the lower the testosterone tends to be. Fragmented sleep of any kind disrupts the normal overnight testosterone production cycle. If your boyfriend snores heavily, wakes up feeling unrefreshed, or is constantly tired during the day, poor sleep quality could be dragging his desire down without either of you realizing it.
Other physical causes include thyroid disorders, diabetes, obesity, and heavy alcohol use. Any of these can lower testosterone or interfere with the complex chain of signals between the brain and body that produces sexual desire.
The Pursuer-Distancer Trap
Relationship therapists point to one dynamic as the most common reason couples lose sexual intimacy over time: the pursuer-distancer cycle. Here’s how it works. One partner notices the gap in sexual frequency and starts pursuing more, through initiating, asking what’s wrong, or expressing frustration. The other partner, already feeling pressure or guilt, pulls back further. The more one pursues, the more the other distances. Both partners end up stuck, and neither gets what they need.
You may not even realize you’re in this pattern. Pursuers often come on stronger than they intend to, and distancers often withdraw more than they mean to. The cycle feeds itself. If you’ve noticed that bringing up sex seems to make him less likely to initiate, or that your attempts to talk about it end with him shutting down, this dynamic is probably at play. Recognizing the pattern is the first step toward breaking it.
Pornography: Less Clear-Cut Than You’d Think
It’s natural to wonder whether pornography is the problem, and in some cases it can be a factor. But the research is more nuanced than the popular narrative suggests. Studies looking at whether pornography use increases or decreases general sexual desire have found that the effects are roughly evenly split: some people report increased interest in sex, and about an equal number report decreased interest. There isn’t strong evidence that pornography use routinely “rewires” the brain to the point where a real partner becomes unappealing.
That said, context matters. If your boyfriend is using pornography frequently while consistently declining sex with you, the issue may not be the pornography itself but what he’s avoiding. For some men, solo sex feels lower-stakes than partnered sex, especially if there’s performance anxiety, body image concerns, or unresolved tension in the relationship. The pornography becomes an escape from vulnerability rather than a replacement for attraction.
What “Normal” Frequency Actually Looks Like
Before assuming something is wrong, it helps to know what’s typical. Survey data from 2020 shows that among men aged 18 to 24, about 37% have sex at least once a week. That number rises to around 50% for men aged 25 to 44. That means roughly half of men in their prime relationship years are having sex less than once a week. There’s no universal standard for how often couples “should” have sex, and the gap between your expectations and his may be smaller than it feels when you’re the one wanting more.
The more important question isn’t frequency but change. If your boyfriend has always had a lower drive than you, that’s a compatibility conversation. If his desire dropped noticeably from where it used to be, something shifted, and it’s worth figuring out what.
How to Talk About It Without Making It Worse
The conversation matters as much as the cause. Sex requires vulnerability, and for that vulnerability to happen, both of you need to feel safe enough to say what’s actually going on. If the conversation starts with “Why don’t you want me anymore?” he’s likely to hear an accusation and get defensive, which pushes him further into the distancer role.
A more productive approach is to frame the conversation around closeness rather than performance. Talk about missing the connection, not the act itself. Share what you’re feeling without assigning blame for it. “I’ve been feeling disconnected from you lately and I miss being close” opens a different door than “We never have sex anymore.” The goal isn’t to change each other but to understand what’s happening for both of you. Ask what he’s been feeling generally, not just sexually. You may learn that he’s dealing with stress, health issues, or emotions he hasn’t known how to bring up.
Timing matters too. Don’t have this conversation in bed, right after a rejection, or during an argument. Choose a low-pressure moment when you’re both relaxed and not already activated. And be prepared to listen to an answer that has nothing to do with you. For many men, admitting that stress, medication, or a health issue is affecting their sex drive feels deeply vulnerable. Creating space for that honesty is the most productive thing you can do.
When It Might Be Clinical
Persistently low desire that causes significant distress is a recognized medical condition called hypoactive sexual desire disorder. The diagnostic criteria require two things: a persistent or recurring lack of sexual fantasies and desire, and marked personal distress or relationship difficulty because of it. This isn’t just a “phase” or a preference for less sex. It’s a sustained absence of desire that bothers the person experiencing it. If your boyfriend acknowledges that his low drive is unusual for him and it’s causing him distress too, a healthcare provider can evaluate hormonal, medical, and psychological causes and help identify a path forward.