English: High-tech toilets in Japan are the most elaborated in the world. These bidets are commonly called washlets, and include many advanced features rarely seen outside of Asia. The feature set commonly found on washlets are anal hygiene, bidet washing, seat warming and deodorization. These high-tech toilets allow water temperature and water pressure to be adjusted to match the preferences of the user. By default, the vulva receives less pressure than the anus. Researchers in Japan have found that most users prefer a water temperature slightly above body temperature, with 38 °C (100 °F) considered optimal. High-end washlets like this one allow selection of vibrating and pulsating jets of water. The washlet can replace toilet paper completely, but many users opt to use both wash and paper in combination—although use of paper may be omitted for cleaning of the vulva. Some wipe before washing, some wash before wiping, some wash only, and some wipe only—each according to his/her preference. The heated seat may be adjustable from 30 °C to 40 °C. Here washlets of a room in the hotel Champion City, Tokyo.