INSIDER - Apr 9 - The number of women and men aged 18 to 39 years old who had never had heterosexual sex increased from 21.7% and 20% to 24.6% and 25.8% respectively between 1992 and 2015, which is an increase of ~5% in 23 years. Compared to other countries, the rates of people with no heterosexual experience are 1-5% of people in their 30s in the UK, US, and Australia. There are more and more old people in Japan, and women aren't having enough children to maintain the population. This has led some to refer to the country as a "demographic time bomb". People in their 30s who still live with their parents are known as "parasitic singles," and some are turning to cartoons for companionship.