Sorry for being extremely late with my post on Japanese toilets.
First, here’s a pic from Wikipedia:
This is almost identical to the one in my house, except the one in my house has no English on it. I think the picture is pretty self-explanatory. As Japanese houses don’t have central heating, in the winter time, heated seats are quite welcome. Our toilet also has a sink built into the top of the back which saves water. It filters the water through for the next flush. Every Western style toilet I have come across in Japan has two flush levels, big and small. Some public restrooms have toilets with such features as well. Otherwise, they are normative for houses, hotels, etc.
Shower/bath rooms in Japan have electrically controlled water. There’s a little box on the wall that lets you set the exact temperature you want the water for your shower/bath (the nozzles do not affect temperature in any way). My host mother has ours set to a comfortable 42 degrees Celsius. If taking a bath, you can have it fill up the bath and stop at the appropriate point automatically.