Muscle Dysmorphia and Sex: Why Body Obsession Hurts Intimacy

Boys and young men who report stronger symptoms of muscle dysmorphia are more likely to experience a wide range of sexual difficulties, according to a new peer-reviewed study. The research team analyzed survey data from 1,116 sexually active boys and men between the ages of 15 and 35 in Canada and the United States, as reported by Medical Xpress. Greater muscle dysmorphia symptoms were associated with seven of the eight sexual difficulties the researchers measured. The paper, led by Kyle T. Ganson of the University of Toronto, was published in October 2026 in the journal Body Image.

Muscle dysmorphia is characterized by an intense preoccupation with muscularity, deep dissatisfaction with one's own body, and impaired social or everyday functioning, according to the study authors. It is often described informally as the belief that one is never muscular enough, regardless of how much muscle a person has built. Until now, research on the condition focused mainly on compulsive exercise, rigid eating, and the use of performance-enhancing substances, as reported by Scienmag. The new findings push the picture into more private territory.

The difficulties linked with greater symptoms included feeling anxious during sex, a lack of sexual interest or enjoyment, a lack of arousal, difficulty reaching climax, physical pain during sex, and difficulty getting or maintaining an erection. Only one measured difficulty showed no association, a pattern the authors describe as evidence of how broad the connection is, according to Medical Xpress.

How muscle dysmorphia disrupts intimacy

Within the cluster of symptoms, appearance-related distress stood out. Greater dissatisfaction with how one looks and greater discomfort with one's own body were consistently tied to the difficulties, and the single strongest link was with feeling anxious during sex, according to the researchers. One explanation, Ganson said, is that intense self-consciousness makes it harder to stay present and comfortable during intimate moments, as reported by Medical Xpress. When attention is consumed by monitoring how the body looks, there is less room for arousal and enjoyment — a pattern researchers sometimes call spectatoring, or watching oneself from the outside instead of participating.

That mechanism fits wider evidence connecting body image with sexual well-being, according to the study authors. Persistent dissatisfaction, shame, and preoccupation with appearance have been shown in earlier research to make it harder for people to feel comfortable and engaged during sex. The new study extends that line of work to boys and young men, a group historically underrepresented in body-image research that long centered on thinness concerns among girls and women.

The pursuit of muscle may add a physical layer

Psychology may not be the whole story. The behaviors that often accompany the drive for muscularity can themselves interfere with sexual functioning, the authors note. Excessive exercise can leave the body fatigued, and rigid restrictive eating can drain the energy reserves that healthy sexual response depends on, as reported by Scienmag. More concerning, the authors write, is the use of anabolic-androgenic steroids and other muscle-enhancing substances, which can disrupt the endocrine system; stopping steroid use can suppress natural testosterone production and produce hormonal disturbances affecting libido, erectile function, and mood. Because the data were collected at a single point in time, the precise pathways still need untangling, according to the researchers.

A research thread years in the making

The new paper caps several years of work from Ganson's lab on muscularity-oriented body image. An earlier study from the team, published in the journal Sexual Health, found links between involvement in sex work and muscle dysmorphia symptoms among Canadian adolescents and young adults, as reported by PsyPost. A 2024 paper in the journal Sex Roles then tied conformity to rigid masculine norms — such as self-reliance and emotional control — to greater muscle dysmorphia symptoms across gender identities, according to News-Medical. The October 2026 study moves that program from who is affected to how the condition reaches into daily life.

There are limits to what the findings can prove. The survey captured one moment in time, so it cannot establish whether muscle dysmorphia symptoms come before the sexual difficulties, follow them, or reinforce each other in a cycle, the authors acknowledge. Self-reported answers about intimate experiences can also be imperfect, and unmeasured factors may play a role. The team calls for longitudinal studies that track people over years, plus research measuring physiological indicators alongside self-reports, to sort out how much of the link is psychological, behavioral, or tied to substance use.

What muscle dysmorphia means for care

For clinicians, the message is practical: sexual health belongs in the assessment. “Sexual health should be part of the conversation,” Ganson said, when clinicians evaluate boys and men with significant muscle dysmorphia symptoms, according to Medical Xpress. Sexual-health questions are not routine in body-image treatment today, and that omission may leave real suffering unaddressed. The reverse gap exists too: a young man reporting erection difficulties is often evaluated for vascular, hormonal, or medication-related causes, the authors note, without anyone asking about muscularity dissatisfaction or compulsive exercise.

For readers steeped in gym culture and fitness feeds, the study reframes a familiar pressure. The relentless comparison of physiques online — the “looksmaxxing” era of jaw exercises, bulk-and-cut cycles, and transformation posts — can look like discipline from the outside while functioning as distress on the inside. If body dissatisfaction follows young men into their most intimate moments, then addressing how they feel about their bodies is not vanity work; it is health work. The finding also adds a new layer to the broader conversation about young people's intimate lives, including recent reporting on the Gen Z sex recession.

Body image and sexual health are often treated as separate territories, but this research suggests they are deeply connected, according to the study authors. For some boys and men, working through distress about their bodies may also be key to understanding difficulties in their sexual lives. More coverage on this beat: Sexual Wellness.