[golemotron]

Let's see.. it was simultaneous and synchronized across the Anglophone countries in the early 2010s.

It's sort of peculiar for Puritanism to appear suddenly and simultaneously in widely distant countries that share a common language but have different cultures, right?

No, I think the change in phones and what they enabled in social media is a better explanation.

[gibbonsrcool]

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

[golemotron]

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]

Japan is in some sense at the leading edge of male isolation and loneliness and depression.

[fomine3]

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.