Durex is set to launch a new blood-flow boosting condom that promises to improve a man's erection, increase his stamina and even boost his penis size.

The condom was awarded a CE mark in August, which means it can be sold across Europe over the counter. So unlike its wearers, it should be coming soon.

Dubbed 'Viagra in a condom', Durex's new offering contains a patented gel inside the tip that boosts blood flow within the penis, promising a firmer, larger and longer-lasting erection.

The Zanifil gel, from Futura Medical Plc, is based on the chemical nitroglycerine, which has been used to treat chest pain and heart failure since the 19th century. The drug widens the blood vessels by relaxing the muscles in the vessel walls, increasing blood flow.

The condom, known as CSD500, is expected to bring some seriously stiff competition to the existing market. In comparison trials with standard condoms, a significant proportion of testers reported improvements in their erection and penis size, while many women reported a longer-lasting sexual experience.

A spokesman for Futura said: “The commercial potential of CSD500 is obvious with one in 10 men in the world having erectile dysfunction. 

“However, CSD500 differs from erectile dysfunction drugs like Viagra because it is specifically aimed at men who struggle to maintain an erection whilst wearing a condom.”

Manufacturers also claim the product would encourage men to use protection and help curb the spread of sexually transmitted diseases.