You just linked to an article that debunks the myth that Japanese are less sexually active than other people. TL;DR: the study that started it all, claiming that 40% of Japanese are virgins, was limited to people who have never married and this obviously skews the sample greatly.
https://www.theguardian.com/world/2022/sep/14/record-number-... (Record number of young people in Japan rejecting marriage, survey shows; Rise in people aged 18-34 who don’t intend to marry has consequences for Japan’s low birth rate and depopulation concerns)
