There is a similar movement growing in the US which is called "MGTOW", men going their own way: https://en.wikipedia.org/wiki/Men_Going_Their_Own_Way
Personally, I'm a bit scared that we're going towards a culture of increasing isolation and tension between the genders.
https://en.wikipedia.org/wiki/Western_European_marriage_patt...
> The Western European marriage pattern is a family and demographic pattern that is marked by comparatively late marriage (in the middle twenties), especially for women, with a generally small age difference between the spouses, a significant proportion of women who remain unmarried, and the establishment of a neolocal household after the couple has married. In 1965, John Hajnal discovered that Europe is divided into two areas characterized by a different patterns of nuptiality. To the west of the line, marriage rates and thus fertility were comparatively low and a significant minority of women married late or remained single and most families were nuclear; to the east of the line and in the Mediterranean and particular regions of Northwestern Europe, early marriage and extended family homes were the norm and high fertility was countered by high mortality.
That is by most peoples' expectations widespread, up to some allowance for out-of-wedlock births (which the Catholic Church in Ireland famously acted forcefully against).
Historically if you weren’t celibate there was going to be a baby.
> Our knowledge of biology is not innate
It's not,but we've known what the result of "seeding a woman" has been for several thousand years so I have a hard time believing it took that long to come up with the pull out method. For the poor bedrooms are also a recent invention, they probably got a lot more sex-ed passed down directly.
I'm not sure what lessons we can draw from Japan/Korean, though, as these revelations all seem to be from relatively recently and the long-term impacts haven't been seen or explored yet. The main obvious consequence is plummeting birth rates [5, 6], which will probably have drastic economic consequences, but we may not see those consequences for decades.
1: https://www.google.com/search?q=japan+sex+rates
2: https://www.cnn.com/2016/09/20/asia/japanese-millennials-vir...
3: https://en.wikipedia.org/wiki/Celibacy_syndrome
4: http://theconversation.com/why-young-people-in-south-korea-a...
5: https://www.theguardian.com/world/2018/dec/27/japan-shrinkin...
6: https://qz.com/1556910/south-koreas-birth-rate-just-crashed-...
There are cultures where sex ratio has been manipulated, e.g. India and China, to favor males, but this is not the point of the research and I lack relevant data for these.