Increasing numbers of southeast Asian men, particularly in Japan, South Korea and Taiwan are marrying foreigners because fewer women in their homelands are willing to wed, a new study said Monday.

The phenomenon, which dates back more than a decade, has even created a detectable trend in women's migration, said the study by Daniele Belanger of the University of Western Ontario University.

"Since the beginning of the 1990s, more and more men in southeast Asia are looking abroad to find a wife," wrote Belanger in the journal of France's National Institute for Demographic Studies (INED).

In Taiwan, 15 percent of wives were of foreign origin in 2009; eight percent in South Korea.

In Japan, the phenomenon started earlier, in the 1980s, but has remained at a modest level: only five or six percent of marriages in the mid-2000s involved foreign wives.

But in all three places, foreign brides represented the largest group of new immigrants apart from the temporary workers, wrote Belanger. And the reason was the lack of women at home, she added.

With women's education levels rising so was their representation in the workplace, she explained.

Increasing numbers of them were not willing to settle for the traditional role of a wife -- at least as it exists in its current form. They preferred to keep their jobs and stay single.

For men however, "they have the responsibility to continue the paternal line by giving birth to a son and, in many cases, looking after their aged parents," Belanger wrote.

They could not therefore remain bachelors.

There were even marriage agencies specialising in this sector, charging the man's family between 5,000 and 10,000 euros.

(Read by Lee Hannon. Lee Hannon is a journalist at the China Daily Web site.)

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(Agencies)