Toto Washlet bidet toilet seat
This is one of those items that people wrinkle their faces at. But I can tell you once you have one you won't want to live without one. The Toto Washlet started the whole craze, and is just a very good device. Highly recommended. The ones I really like have a wall mounted remote control panel that you can also hold in your hand.
The unit has a heated seat, water temperature adjustment, positioning adjustment, water pressure adjustment. Even a deodorizer. Did I mention it dries your butt off after you use it?