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The decline in young people's sexual activity is a recent event: https://www.scientificamerican.com/article/people-have-been-having-less-sex-whether-theyre-teen

• golemotron 4y ago
  That started in Japan around 2000, a good ten years before the mental health crisis that struck kids at about 13 years of age in English speaking countries simultaneously.
  • theGnuMe 4y ago
    Japan is in some sense at the leading edge of male isolation and loneliness and depression.
    • fomine3 4y ago
      And limited internet access on feature phone (i-mode, J-Sky, EZweb) was a thing from around 2000. Many students had it. So it strengthen original argument.