Not tonight, Dear, I have to reboot.

A t the Museum of Sex in New York City, artifi cial-intelligence researcher David Levy projected a mock image on a screen of a smiling bride in a wedding dress holding hands with a short robot groom. " Why not marry a robot? Look at this happy couple, " he said to a chuckling crowd. When Levy was then asked whether anyone who would want to marry a robot was deluded, his face grew serious. " If the alternative is that you are lonely and sad and miserable, is it not better to fi nd a robot that claims to love you and acts like it loves you? " Levy responded. " Does it really matter , if you're a happier person? " In his 2007 book, Love and Sex with Robots, Levy contends that sex, love and even marriage between humans and robots are coming soon and, perhaps, are even desirable. " I know some people think the idea is totally outlandish, " he says. " But I am totally convinced it's inevitable. " The 62-year-old London native has not reached this conclusion on a whim. Levy's academic love affair with computing began in his last year of university, during the vacuum-tube era. That is when he broadened his horizons beyond his passion for chess. " Back then people wrote chess programs to simulate human thought processes , " he recalls. He later became engrossed in writing programs to carry on intelligent conversations with people, and then he explored the way humans interact with computers, a topic for which he earned his doctorate last year from the University of Maastricht in the Netherlands. (Levy was sidetracked from a Ph.D. when he became an international master at chess, which led him to play around the world and to found several computer and chess organizations and businesses.) Over the decades, Levy notes, interactions between humans and robots have become increasingly personal. Whereas robots initially found work, say, building cars in a factory, they have now moved into the home in the form of Roomba the robot-ic vacuum cleaner and digital pets such as Tamagotchis and the Sony Aibo. And the machines can adopt a decidedly humanoid look: the robot Repliee from Hiroshi Ishiguro, director of Osaka Uni-versity's Intelligent Robotics Laboratory, can fool people into believing that it is a real person for about 10 seconds from a few feet away. And …