Yes, for only $1,100, you too can have fish swimming around behind you while you take a dump. And yes, your fish will be safe from getting flushed down the toilet when you go to the bathroom. It uses a different tank for that...
I remember seeing one of those on some re-modeling show on tv. I might be mistaken, but it was said you didn't use toilet paper; you use the spray gun thing. It comes under you and rinses you with water? There were like different settings on how the water sprayed you. It was wierd.
Any where in Japan nice enough to have a stylish toilet will have toilet paper. But they do have totaly kick ass washing jets in them. The first time you try one out it feels like some strange homoerotic ritual. After complete screwing your basic bodily functions due to the diet and time change, one all night drinking binge and that fancy toilet is a god send.
While it's true that some toilets do have one built into them, generally speaking, a bidet is its own facility:
Seems a little akward to me, though...
Also, Japanese washlets make a distinction between which part of the body is being washed. The word BIDE (bidet) is reserved for cleaning the front (for women, obviously), and oshiri (the behind) is used for the rear.
One of the weirdest parts of Japanese culture is the massive specturm of toilets. You can go from a throne for tech heads with all the bells and wistles to a hole in the ground with no paper.