Sorry - I got hold of the wrong end of Sriram's stick!
I actually do side with him. (As I write, the Radio4 PM problem is doing an item on Japan and no sex.)
I'm probably with Sriram here. My 33 years of marriage were the most fulfilling and precious of my life.
I have had a good career, rose to senior positions in the corporate world, made some money and retired after 35 years. But I hardly remember all of that and it doesn't mean very much to me today. What I remember happily is my family. I remember the times spent with my wife, my parents, my in laws. I cherish the time spent with my children as they grew up, teaching them things, showing them the world, enjoying movies, eating in restaurants, going for holidays.
I am sure most of our forefathers were like that and many people are like that even today.
I can understand a few people being dedicated to some special cause and giving up on sex and family life. But how nearly 50% of youngsters can do that, for routine jobs, is beyond me. A sign of the times I suppose! Nature is telling us something here!!
PS: Maybe the focus on AI and robotics in Japan has something to do with it.......