Just one of the images picked up along Wired stroll at Japan's First Sex Show, the 3 day "Adult Treasure Expo" back in July 2007:

The Piston Robot is designed for one woman to use by herself, or a couple together. The topmost section with the two dildos moves back and forth in its groove.
The company claims the 33,600-yen device (about $300) has a "human feel. " The self-heating dildo takes 30 minutes to get to body temperature. You can also attach your own favorite dildo, the company said. The machine's multispeed controller runs from one to 150 strokes per minute.
The company also offers a 168,000-yen ($1,450) Robo-chair incorporating the Piston Robot.
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