<P> Some metal toilets, such as those in many jails and prisons, have built - in toilet seats that cannot be removed, so that an inmate cannot fashion it into a weapon, shield or escape tool . </P> <P> The International Association of Plumbing and Mechanical Officials' Uniform Plumbing Code, section 409.2. 2, requires that "all water closet seats, except those within dwelling units or for private use, shall be of the open front type". There is an exception for toilets with an automatic toilet - seat cover dispenser . The code has no legal force, but because it is followed by many public authorities, many public toilets feature open front toilet seats (also called "split seats"). </P> <P> The purpose for this seat design is to allow women to wipe the perineal area after using the toilet without contacting the seat . It also omits an area of the seat that could be contaminated with urine, and avoids contact between the seat and the user's genitals . </P> <P> High - tech toilet seats may include many features, including a heated seat, a bidet, and a blow drier . High - tech seats are most common in Japan, where a seat with integrated bidets is colloquially called a Washlet, after a leading brand . Electrically heated toilet seats have been popular in Japan since the 1970s . Since Japanese bathrooms are often unheated, the toilet seat sometimes doubles as a space heater . Integrated bidets date from around 1980, and have since become very popular in Japan, and are becoming more common in most other developed countries . </P>

Why do commercial toilet seats have a split
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