The always readable Mark Steyn writes about the growing disinterest in sex in Japan, and relates it to P.D. James' dystopian novel The Children of Men. See his column entitled "Sex at Sunset" at the Steyn Online website.
COTTonLINE wonders if we see in Japan the beginning outline of the end of humanity, our species dying off with a sigh, not a bang. Of course the professionally pessimistic Steyn likes to imagine we're a doomed species.
A perhaps more realistic hypothesis is that Japan represents a culture dying, rather than the template for a moribund species.