I can tell you, from personal experience, that this is all pretty amazing stuff. The US is without doubt, um, behind in the field of toilet technology. Far behind.
No country takes toilets quite so seriously as Japan.
Machines with heated seats, built-in bidets and a dynamic range of flushing options are almost ubiquitous in homes and public buildings.
A poem recently published by a stressed-out salary man captured their comforting appeal with haiku-like brevity. “The only warmth in my life is the toilet seat,” he mourned.
But lavatories here can do much more than keep you warm. One even sends a tiny electrical charge through the user’s buttocks to check their body-fat ratio.