# Man Who Masturbated for Nearly 10 Hours Details Physical Strain and Health Warnings

> Masanobu Sato, who sustained nearly ten hours of continuous masturbation during a past endurance event, has opened up about the severe physical toll on his body. Health specialists caution against prolonged friction, outlining the risks of soreness, swelling, and nerve irritation.

**Type:** article · **Category:** Sexual Health · **Published:** 2026-09-24 · **Source:** TrendKia
**Canonical:** https://trendkia.com/en/sexual-health/lagatara-10-ghnte-ke-hastamaithuna-rikorda-ke-bada-sharira-para-asara-masanobu-sato-ne-sajha-kiya-anubhava-37855 · **Language:** English
**Tags:** masturbation, Masanobu Sato, sexual health, health advice, gooning, men health

A former endurance competitor who engaged in nearly ten hours of continuous masturbation has shared details regarding the intense physical strain the experience inflicted on his body. At age 26, Masanobu Sato participated in the 2009 US Masturbate-a-thon organized by The Center for Sex & Culture in San Francisco, setting an endurance benchmark of nine hours and 58 minutes. That performance surpassed his 2008 effort of nine hours and 33 minutes, securing the endurance category win across two successive years. Sato, now 43 and serving as the Malaysia-based chief executive officer of TENGA Healthcare, noted that his motivation centered on challenging societal stigma around self-pleasure and opening wider discussions on human sexuality.

## Severe Friction and the Wounded Soldier Comparison
Sustaining friction and stimulation for that length of time produced substantial trauma on sensitive genital tissues. Speaking to the adult-interest publication Erobella, Sato recalled how his penis showed immediate signs of distress following the marathon event. He described the surface of the organ as appearing dark, chafed, and heavily battered, comparing its post-event condition to that of a wounded soldier. Beyond the localized irritation, Sato experienced comprehensive exhaustion, noting that the continuous sensory stimulation drained both his mental concentration and muscular stamina.

## Medical Risks of Extended Genital Friction
Clinical experts note that submitting any delicate area of the human body to ten hours of unceasing mechanical force poses distinct health concerns. Sarah Mulindwa, senior sexual health nurse and specialist with Lovehoney, explained that the immediate consequences typically include soreness, redness, chafing, localized swelling, and temporary numbness or sensory blunting. Aggressive and extended stimulation may also inflame the sensitive lining of the urethra or cause microscopic skin tears. For individuals with foreskin, repeated manipulation frequently leads to severe swelling and acute tenderness.

Medical professionals emphasize that while mild friction burns or soreness usually resolve after a day or two of complete rest, certain warning signs demand prompt clinical attention. Immediate medical evaluation is warranted if a person develops severe or persistent pain, extensive bruising, difficulty passing urine, visible bleeding, abnormal discharge, prolonged loss of sensation, or symptoms indicative of an underlying infection. While routine masturbation remains a harmless physiological act, neglecting painful bodily feedback can lead to complications.

## The Phenomenon of Gooning and Muscular Strain
In online spaces, extended masturbation sessions focused on repeated edging—bringing oneself repeatedly near orgasm without completing the climax—are widely referred to as gooning. Clinical sexologist and psychotherapist Ness Cooper pointed out that extended sessions carry the risk of painful skin fissures and extreme genital hypersensitivity that eventually requires complete cessation of activity. Prolonged static positioning during such sessions can also trigger intense cramping and tension across the glutes and pelvic floor muscles. For individuals engaging in lengthy sessions, adequate lubrication is vital to limit surface damage.

Cooper explained that the popular appeal of prolonged arousal often stems from the neurochemical cascade accompanying sexual excitation. The gradual release of stress-reducing hormones prior to, during, and following climax can provide transient emotional relief. However, overextending the process can easily turn psychological relief into physical injury.

## Underlying Delayed Ejaculation and Unusual Training Regimens
The marathon endurance attempt also highlighted an existing medical condition that Sato had navigated for years. Following a circumcision procedure at age 20, his genital sensitivity shifted significantly, leading to persistent challenges with delayed ejaculation during sexual intimacy. Sato stressed that the ability to last an unusually long time is not always a beneficial trait, pointing out that delayed ejaculation can be a deeply frustrating clinical condition rather than a point of personal pride.

To endure the event, Sato undertook non-traditional mental conditioning. He trained himself to maintain physiological arousal while watching comedic television programming, deliberately decoupling his physical response from explicit erotic stimuli. Additionally, to overcome stage anxiety in front of a live audience, he entered an Air Sex tournament, a Japanese theatrical performance art where participants pantomime intimate encounters while fully dressed. The exercise helped him manage performance nervousness in public settings.

## Rejecting Pleasure as an Endurance Sport
After reaching the six-hour mark during the competition, Sato encountered severe mental and physical fatigue, finding that sustaining the effort felt far closer to rigorous athletic training than personal enjoyment. While he derived personal meaning from the unique experience, he strongly advises others against attempting similar feats. Health professionals and Sato alike emphasize that personal intimacy should not be treated as a competitive sport, underscoring that ordinary self-care is vastly different from extreme endurance trials.

## What this means for you
Extending masturbation over unusually long periods carries tangible risks of tissue irritation, nerve desensitization, and pelvic strain.

- **Tissue and Nerve Health:** Continuous friction can abrade delicate skin and cause temporary numbness across genital nerves. Allowing one to two days of complete rest is typically required for mild tissue recovery.
- **Muscular Strain:** Remaining in fixed postures during long sessions can lead to acute tightening in pelvic floor and gluteal muscles. Changing positions and limiting session lengths effectively prevents persistent muscular fatigue.
- **Lubrication Practices:** Operating without sufficient lubrication rapidly increases the risk of microscopic tears and skin fissures. Applying adequate lubricant remains an essential step to mitigate surface friction and abrasions.
- **Medical Consultation Threshold:** Persistent severe pain, difficulty urinating, unusual bleeding, or lasting numbness require timely medical evaluation. Mild soreness usually clears promptly, but unresolved symptoms signal potential infection or deeper trauma.

## Why this happened
This occurrence unfolded when a participant joined an endurance event in San Francisco to challenge longstanding social taboos surrounding sexual health. An underlying physiological condition and deliberate psychological preparation enabled the unusual record.

- **Challenging Social Stigmas:** Sato sought to dismantle public shame and silence regarding masturbation and sexual wellness. He chose to publicly participate in the US Masturbate-a-thon to spark open, unapologetic conversations.
- **Underlying Clinical Factors:** Following a surgical circumcision at age 20, altered sensory feedback caused Sato to develop delayed ejaculation. This specific clinical dynamic made long durations physically attainable for him.
- **Unconventional Training:** He deliberately conditioned himself by watching comedic television to maintain physical arousal without erotic imagery. Participating in theatrical Air Sex competitions further removed anxiety associated with public performance.

## Questions & Answers

### 1. What record did Masanobu Sato establish during the event?
In 2009, he maintained continuous masturbation for nine hours and 58 minutes at an event in San Francisco.

### 2. How did Sato describe his physical state following the session?
He described his penis as resembling a wounded soldier with dark, worn skin, alongside complete physical and mental exhaustion.

### 3. What medical complications can arise from prolonged friction?
Health professionals highlight risks including chafing, skin tears, swelling, urethral irritation, and temporary numbness.

### 4. Do specialists recommend endurance-style prolonged masturbation?
No, both clinical experts and Sato caution against treating personal pleasure as an endurance activity.

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