Science is trying its level best to improve people''s sex lives -and the latest offering from scientists is a spray which helps men last six times longer in bed
Developed by British doctors, the treatment - used five minutes before sex - can extend love-making time from seconds to almost four minutes.
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The study has been published in an issue of BJU International.
To reach the conclusion, three hundred men with clinically diagnosed lifelong premature ejaculation (PE) from 31 centres in the UK, Czech Republic, Hungary and Poland, were randomised into two groups.
Two hundred used the PSD502 spray, which contains 7.5mg of lidocaine and 2.5mg of prilocaine, and 100 used a placebo spray with no active ingredients.
Every time they had intercourse during the three-month study period, each couple measured the time from vaginal penetration to ejaculation with a stopwatch.
The men were asked to abstain from sexual activity or masturbation for 24 hours before each recorded encounter.
The time from penetration to ejaculation increased from an average of 0.6 minutes to 3.8 minutes in the medicated group and to just 1.1 minutes in the placebo group.
When these figures were adjusted to take account of any variations between the two groups, these showed that the treatment group were able to last 6.3 times longer after penetration when they used the spray. The placebo group lasted 1.7 times longer.
"Premature ejaculation can be a very distressing condition for men and can cause distress, frustration and make them avoid sexual intimacy" says lead researcher Professor W Wallace Dinsmore from the Royal Victoria Hospital, Belfast, UK.
The research team used the evidence-based definition of lifelong PE developed by the International Society for Sexual Medicine to select their study subjects.
This states that ejaculation occurs within about one minute of vaginal penetration in the majority of encounters.
"Because this definition was only launched in 2008, studies have yet to determine the prevalence of lifelong PE in the male population" says Professor Dinsmore.
"But previous research suggests that as many as 40 percent of men will experience premature ejaculation at some time in their lives," the expert added.
The 300 men who took part in the phase three, multicentre, double-blind, randomised study had an average age of 35. The majority had used other treatments before, the most common being oral antidepressants.
After three months of treatment the researchers reported that 90 percent of the men in the treatment group were able to delay ejaculation for more than one minute following vaginal penetration, compared with 54 percent in the placebo group.
Seventy four percent of men in the treatment group managed to last more than two minutes before ejaculation, compared with 22 percent in the placebo group. 62 percent of men in the treatment group said their orgasms were ''good'' or ''very good'' after three months, compared with 20 percent before the study started. The figures for the placebo group were slightly lower at the end than at the start. Also, a significantly higher percentage of the patients and partners in the treatment group reported improvements when it came to perceived control, personal distress, satisfaction with sexual intercourse and interpersonal difficulties.
"Our study shows that when the PSD502 spray was applied to the man''s penis five minutes before intercourse it improved both sexual performance and sexual satisfaction, which are key factors in treating premature ejaculation" says Professor Dinsmore.
"It was well tolerated by both patients and their partners, with no systemic side effects and a low incidence of localised effects and was rated favourably by the majority of users.
"We believe that this shows that PSD502 offers significant advantages over other therapies being developed for the treatment of premature ejaculation," the researcher added.
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