About a quarter of people aged 18 to 39 in Japan were estimated to have had no experience of heterosexual intercourse as of 2015, higher than 20 percent more than two decades ago, a team of Japanese and Swedish researchers said Monday.Researchers at the University of Tokyo and Karolinska Institutet said in an article in the British medical journal BMC Public Health that the percentage of people with no such experience rose among men to 25.8 percent in 2015 from 20.0 percent in 1992, and among women to 24.6 percent from 21.7 percent, based on data from a fertility survey conducted by the Nat…READ FULL ARTICLE