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Record numbers of young Japanese do not have boyfriends or girlfriends, and many do not want one, according to a survey by the country's government. Sixty-one percent of unmarried men aged 18 and 34 do not have a partner, nor do half of unmarried women the same age. The numbers have increased since the previous survey in 2005. Japan has one of the lowest birth rates in the world - and its population is on course to shrink dramatically by the middle of the century. So every five years the government carries out a detailed survey of attitudes to sex and marriage. | 
