I dont know how to do the box thing so:
***MILD SPOILERS AHEAD***
That’s more or less how I saw it too. I think there might be a little confusion here.
As I see it:
They have an already too small, shrinking living place. They are engaged in heavy training, both male and female, and all their attention must be focused on the preparations. Kids would consume too much time and resources.
As evidence I offer the fact that even the non-transforming, non-magic tanuki weren’t allowed kids and that one year latter when they did have children their powers was reaching a neever before seen level.
As to japanese sexual mores, I dunno. The film seemed didn’t seem to have much in the way of sex or a concern with sex and sex relations. In fact the egality amongst the tanuki was amazing. There seemed to be a very equal sharing of work and responsability. Even the often mentined big balls didn’t seem to have any sexual significance. They were used for humour and that was that
I think that’s because the tanuki are a sort of ideal society. They are what humans were or could have been. There’s even a point were the tanuki especulate about this conection. One of them says something, IIRC, more or less like this: “They can’t do that. Beings without magic/powers/something can’t do that. They are tanuki. They are decayed, evil tanuki that forgot what they are. We can’t win against evil tanuki.”
BIG SPOILERS
REALLY HUGE, I GIVE THE ENDING AWAY, SPOILERS
I thought the movie was trying to show how that ideal society we first saw is impossible in modern times. It’s more than just enviromentalism.
The pressures the modern world put in the tanuki psyche are the ultimate cause of their downfall in my opinion. They get divided. They generate terrorist fanatics. They generate suicide cults. All the elders die or run away from the modern world and hide in death/hedonism/places that haven’t yet been modernized. The remaining tanuki cease to be tanuki spiritually, after all, being a tanuki is all about having fun and these aren’t. The remaining tanuki are fewer and fewer living by the grace of the humans and are obviously decadent.
It’s a great movie. The more I think about it, the more I like it. But is just so sad.