The Japanese sex problem has become so desperate that its young population are giving up on dating and are just marrying their friends.

A Government survey found 69 per cent of Japanese men and 59 per cent of Japanese women do not have a romantic partner.

One Japanese aggregator website has since been awash with stories of how people have simply got married to life-long friends.

The country has one of the lowest birth rates in the world, with just 8.4 children being born per 1,000 inhabitants over the last five years.

Its population of 127m people is predicted to decrease to 87m by 2060.

The survey, carried out by the country's National Institute of Population and Social Security Research, also reported that about 80 per cent of unmarried Japanese want to get married.

In recent weeks, people have posted stories to the aggregator website Matome Naver, telling how in one case, a colleague married their friend of 10 years.

The trend has been coined "Kousai zero Nichikon": roughly translated as "marrying without dating".

Japanese actress Maki Horikita married co-star Koji Yamamoto in 2015 after just a month of dating.