NO SEX PLEASE? NO REALLY

A fascinating story from Japan: The youth of the nation do not want t have sex.. so much so that there is a birth crisis on the horizon..

The UK GUARDIAN has a report about Japan, where people seemingly have stopped desiring sexual relations.. As a matter of fact, it’s not just a disinterest, but a large percentage of the nation ‘despises’ sexual contact! 
Even more, the ‘celibacy syndrome’ is so bad that the government is worried about it.
Not mentioned in the story: Worries about Fukushima.. I wonder how many people have stopped being interested in having children because they fear the nation that their children would actually grow up in?
Nonetheless, the GUARDIAN story is worth the read.. 
Is this just evolutionary? That naturally, somewhere along the line, human beings would stop being interested in the very act that resulted in our existence?