This sounds crazy...but
After a war had decimated the Japanese population, the kimono was "invented."
Complete with its own bedroll, the idea was that any man could have any woman --- except I guess a member of the Royal Family --- at any time, at any place.
That is not the remedy for the current Birth Dearth, but something has got to happen if the species is to continue.
Illustrate ??? Hmnnn...