A humanoid robot named "I-Fairy" (C) acts as a witness at the wedding ceremony between Tomohiro Shibata (L) and Satoko Inoue in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters

A humanoid robot named "I-Fairy" (C) acts as a witness at the wedding ceremony between Tomohiro Shibata (L) and Satoko Inoue in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters

A humanoid robot named "I-Fairy" (C) acts as a witness at the wedding ceremony between Tomohiro Shibata (L) and Satoko Inoue in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters

Satoko Inoue (R) puts on a wedding ring for Tomohiro Shibata in front of a humanoid robot named "I-Fairy" during their wedding ceremony in Tokyo May 16, 2010. "The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters

Satoko Inoue (R) puts on a wedding ring for Tomohiro Shibata in front of a humanoid robot named "I-Fairy" during their wedding ceremony in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters

A humanoid robot named "I-Fairy" (C) acts as a witness at the wedding ceremony between Tomohiro Shibata (L) and Satoko Inoue in Tokyo May 16, 2010. The couple decided to use the robot, which conducted the ceremony with its audio functions, from Inoue's company to perform the witness' duties as they first met due to common work interest related to robots. Photo: Xinhua/Reuters