An injection of a hormone into chocolate appeared to make men more excited when they were exposed to the scent of perfume – or images of women's faces.
The simple puncture can improve performance between the sheets of people with low libido.
Known as & # 39; kisspeptin & # 39; It is named in recognition of his discovery at Pennsylvania State University – the city where Hershey's Chocolate Kisses are made.
Dr. co-senior author Alexander Comninos, from Imperial College London, said: "Psychosexual disorders have a major adverse effect on well-being and can be very painful, not only for those affected, but also for their partners.
"Despite the large number of people with these conditions, there are currently limited treatment options.
"Our study shows that kisspeptin can stimulate brain activity related to attraction and intriguingly, this stimulating effect is even greater in men with a low sexual quality of life."
A maximum of one in three men suffers from a sexual problem, such as a low desire, which is psychological rather than physical.
These can damage relationships and fertility. One of the most common is loss of libido or sex drive, which is often related to personal problems, stress or fatigue.
It can also be a sign of an underlying medical problem such as reduced hormone levels – or without any of these problems.
Despite the high clinical burden, there are few treatments due to ignorance of brain processes. Kisspeptin is & # 39; a Viagra of the mind. & # 39;
The study published in JCI Insight included 33 heterosexual men aged 18 to 34 who underwent magnetic resonance imaging (MRI) brain scans while smoking a popular scent and looking at female faces.
This specific scent, Chanel No. 5, has previously been shown to be associated with sexual arousal.
In addition, kisspeptin had a greater effect on men with a lower sexual quality of life when they saw their faces.
The team now hopes to conduct the first clinical trials on patients who have a low libido.
They have previously shown that kisspeptin improves the way the body handles sexual arousal. The latest results emphasize the impact on gray matter.
Attraction is a fundamental process that leads to further sexual arousal, sexual activity and often reproduction.
Dr. Comninos said: "This builds on our earlier work that identified a role for kisspeptin in sexual arousal.
"We have now discovered that kisspeptin can actually improve the processing of odors and facial features, which are often the first steps for sexual arousal.
"We hope that our growing understanding of how kisspeptin stimulates parts of the brain that are involved in attraction and excitement can ultimately lead to new ways to treat the affected people. However, we still have a long way to go."
Kisspeptin is a naturally occurring chemical that stimulates the release of other reproductive hormones in the body.
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The researchers wanted to see if this hormone can be used to stimulate areas of the brain that appeal to young healthy men with normal libido.
Co-senior author Prof. Waljit Dhillo, based in the same lab, added: "Attraction is usually the first step to sexual arousal and it is encouraging to see that kisspeptin can also stimulate brain activity associated with it.
"This new finding helps us to further understand the brain activity of people with psychosexual disorders that can lead to therapeutic goals."
It is thought that one in ten men in the UK has sexual problems, many suffer from a lack of libido caused by relationship problems, stress and anxiety.
This can cause problems for couples trying to have a child and is advised to have regular sex during the month. Kisspeptin hopes to retain the answer.
The team believes that this new insight can lead to new therapies to address psychosexual disorders and plans to conduct further studies to investigate this.
The discovery can also lead to better treatments for stress and depression.