Among the top reasons married couples cite for not having sex, is that after children are in the picture (couples are even discouraged from having intercourse while pregnant), sex can decrease markedly or even become nonexistent for a habit-forming period of time.
About 1 in 5 couples say they simply view sex as a nuisance, a small number cite the lack of private space, because elderly or the children often sleep on just the other side of paper-thin walls.
It was also reported that 83.7% of men who turned 20 that year were not dating anyone, with 49.3% stating they had never had a girlfriend.
59% of female respondents of the same age group responded similarly, a 12% increase from the 2008 survey.
Additionally the survey reported that only 24% of Japanese respondents said they were happy with their sex lives, compared to the global average of 44%.
The reasons for this decline in sex interest are still widely discussed; There are many theories and different contributing factors.
Decreased sex drive in the 21st century has been blamed for the low Japanese birth rate and declining growth of the Japanese population.
Because 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, every five years the government carries out a detailed survey of attitudes to sex and marriage.Some are too stressed out from work, others have "more fun things to do".There is also a tendency among Japanese married couples to feel an aversion to sex with their spouse because they've come to feel that they have more of a relative/sibling relationship, and accordingly cannot see their spouse as a sexual partner anymore.Pornography in Japan has in recent times expanded into new mediums such as manga (hentai) and video games (eroge) in addition to the more common film and historic mediums.Translated literally, the Japanese word shunga means picture of spring; "spring" being a common euphemism for sex in Japan.Homosexuality and bisexuality are less frowned upon than in many other parts of the world.