Despite the fact that bizarre fetishes seem to thrive in this country, sex in itself is not a priority among male teens in Japan. More than a third of teens aged between 16 and 19 declare to have no interest in or are actively averse to sex, according to a government survey. From the Daily Telegraph:
According to the survey of 671 men and 869 women, issued by the Ministry of Health, Labour and Welfare, 35.1 per cent of men aged 16 to 19 said they are not interested in or averse to sex, more than double the 17.5 per cent of men in the previous study in 2008.
Ask any parent of a hormonal male teenager, and they'd be relieved knowing that their son showed disinterest. However, such a low percentile has the government of Japan worried about the nation's birth rate which currently stands at 1.21 per family - far below the rate of 2.08 babies that is required for a stable population.

As of March 2009, Japan's total population stood at just over 127 million, but that figure is projected to decline to 95 million by 2050. And if more drastic measures fail to encourage people to have sex and produce offspring, the population may very dwindle to just 47.7 million at the turn of the next century.

Read more via the Wall Street Journal