You've got an economy that's been stagnant for 25 years, an aging workforce, one of the highest rates of suicide in the world, and huge social pressure to succeed...
Arguably the stagnation is due to the baby boomers hanging on for too long in their cushy positions. This is a problem around the world including Japan. The elderly people may just have to live on less then what their expecting in their old age. I'm with chucky that I don't really see a downside to this. Japan will be better off in thirty years (assuming the world doesn't turn to shit for other reasons.)
I think the whole loss of sexual intimacy reflects that people are pushing are rejecting a lot of the artificiality of the gender relationships that exist in Japan and even in the US too. Men and women are supposed to play roles that don't always make sense in a modern economy. Women tend not to be as interested in sex for sex's sake. In the west they're frequently doing it to snag a guy into a long term relationship. Studies show that a woman's interest frequently declines significantly after a few years in the relationship.