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Penis zapping could combat premature ejaculation, doctors claim.
A man who underwent the therapy was able to stay in bed about seven times longer.
He underwent the treatment, which involved sticking electrodes to his penis for 30 minutes three times a week.
Doctors in Lebanon who treated the unidentified man say he ejaculated within 40 seconds before seeking help.
But six months after completing treatment, he was able to pleasure his girlfriend for almost five minutes before climaxing.
The Beirut-based medics called for studies to determine whether the device can be rolled out to more patients as a safe, drug-free treatment.
Urologists from the Lebanese University described the case of the 28-year-old patient for whom medication did not help.
The patient had been in a relationship with his girlfriend for a year, doctors wrote in the Asian Journal of Urology.
They had sex at least twice a week and he climaxed after just 40 seconds “on almost all occasions.”
Dr. Mohamad Moussa and colleagues tried to pass an electric current through his penis.
They hoped it would stimulate his dorsal penile nerve, one of the nerves that collects movement and sensation information from the penis.
Whenever the man underwent zapping therapy, two electrodes were placed on the surface of his penis.
One was placed at the bottom of his penis while the other sat about 2cm higher.
Over the course of six months, he underwent three 30-minute sessions each week of exposure to continuous current.
It had a frequency of 20 Hz, a pulse width of 200 μs, and the wave was adjusted between 20 mA and 60 mA.
For comparison, patients who receive deep brain stimulation for Parkinson's disease are exposed to more than 100 Hz.
Medical experts did not say whether the treatment was painful, but studies of similar devices said they can be used “without discomfort.”
The man used a stopwatch during sex to measure his intravaginal ejaculatory latency time (IELT) - the time from vaginal penetration to ejaculation.
Before treatment his IELT was 40 seconds. But at the end of the six-month trial, his average IELT jumped to about three minutes and 54 seconds.
And the duration continued to increase even after he stopped using the device, reaching an average of five minutes 14 months later.
This is the average length of time it takes men to ejaculate, according to the NHS.
The team said it was “not fully understood” how the device works to improve premature ejaculation.
But during ejaculation, sperm are released by contraction of the muscles between the anus and scrotum – called the bulbospongiosus and ischiocavernosus.
Doctors believe that stimulation of the dorsal nerve disrupts the muscles, causing them to stop contracting so quickly.
They said the procedure is non-invasive and called for further studies to determine whether it can be used as a safe and drug-free treatment for premature ejaculation.
Up to 40 percent of men experience the problem at some point. But there is no definition for what is called premature ejaculation.
The NHS advises men to seek help for premature ejaculation when half of their attempts at sex are aborted.
The NHS also advises men to masturbate before sex, use a thick condom and take breaks during sex before seeking medical help.
Premature ejaculation can be caused by prostate problems and the use of recreational drugs, as well as stress and anxiety.
Current treatments include dapoxetine tablets, taken a few hours before sex, and lidocaine and prilocaine gels, which delay ejaculation.