Contrary to popular belief in regions where they are uncommon, bidets are not toilet alternatives. They are used to wash the anus, inner buttocks, and genitalia, usually after the user has defecated into an adjacent toilet. Some bidets have been incorporated into toilets, especially in bathrooms that are not large enough for both fixtures. Bidets, like toilets, are typically made from porcelain and contain a deep recess within a wide rim. They emit an arc of clean water from a nozzle that can either be beneath the rear of the rim or deep within the fixture cavity. Users can sit on the rim (or seat, if it has one) or straddle the fixture and face in either direction. He or she can decide which direction to face based on the water jet configuration and the part of their body that needs cleaning. Water temperature and pressure can be adjusted with knobs in order to arrive at the desired settings.