You are missing the point. Many women are also not reproducing/having sex. Or are you advocating mass invasions involving rape like the Vikings and Mongols?!!
Many more Jap women are not interested in sex.
The Jap men not interested in sex follows.
(there was a report on those 2 above).
What steps up are the remaining viable males to impregnate the available sexual females.
Reminds me of that other study that said 8,000 years ago it was 17 women impregnated by 1 man.
To today's 5 women impregnated by 1 man.
Looks like that ratio will increase.
These are signs of the end of times of Japan.
Maybe all that radiation is doing a big number on them and they are in denial.
I live in Manila. I know women, too many women here vs the number of desirable men... the ratio is too large... this is why viable men in this city are happy... women are forced to just share men, having a small piece of a man's time and money.
In the provinces there is a lack of women... many of them have gone to the big towns and cities.
Good thing our Filipino women are still interested in sex.