We Japanese extremely like to be neat and tidy. Most buildings are equipped with a toilet with bidet functions.
Here is a toilet on the 1st floor of my house. A remote controler is on the wall. We can make an adjustment of water pressure, water temperature, temperature of warm air, position, motion of the nozzle and so on.
And here is a toilet on the 2nd floor of my house. The controler is combined to the toilet. This is a cheeper type. This type is offten equipped in public spaces. 
There are some manufacturers which produce bidet-toilets. “TOTO” has the NO.1 market shares. Then “INAX”, “Panasonic” follows. “TOTO” is the company’s name and “Washlet” is the products’ name. It came from the combination of words wash + toilet.
Do you know a famous American rock band “TOTO” which took an active part in 1980′s has come form the bland name of toilet? When the members visited Japan, they saw the name “TOTO” printed on the toilet and named thier band-name as “TOTO” without much thought.
TOTO’s toilet is here. http://www.totousa.com/Washlet/S400.aspx
They are developing the sprashing way every year. http://www.toto.co.jp/products/toilet/apricot/technology/washlet.htm
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