Humans could marry robots within the century. And consummate those vows.

"My forecast is that around 2050, the state of Massachusetts will be the first jurisdiction to legalize marriages with robots," artificial intelligence researcher David Levy at the University of Maastricht in the Netherlands told LiveScience.

Levy recently completed his Ph.D. work on the subject of human-robot relationships, covering many of the privileges and practices that generally come with marriage as well as outside of it.

At first, sex with robots might be considered geeky, "but once you have a story like 'I had sex with a robot, and it was great!' appear someplace like Cosmo magazine, I'd expect many people to jump on the bandwagon," Levy said.

The possibility of sex with robots could prove a mixed bag for humanity. For instance, robot sex could provide an outlet for criminal sexual urges.

"If you have pedophiles and you let them use a robotic child, will that reduce the incidence of them abusing real children, or will it increase it?" Arkin asked. "I don't think anyone has the answers for that yet — that's where future research needs to be done."

Keeping a robot for sex could reduce human prostitution and the problems that come with it.
However, "in a marriage or other relationship, one partner could be jealous or consider it infidelity if the other used a robot," Levy said. "But who knows, maybe some other relationships could welcome a robot. Instead of a woman saying, 'Darling, not tonight, I have a headache,' you could get 'Darling, I have a headache, why not use your robot?'"

Arkin noted that "if we allow robots to become a part of everyday life and bond with them, we'll have to ask questions about what's going to happen to our social fabric. How will they change humanity and civilization? I don't have any answers, but I think it's something we need to study. There's a real potential for intimacy here, where humans become psychologically and emotionally attached to these devices in ways we wouldn't to a vibrator."

Levy is currently writing a paper on the ethical treatment of robots. When it comes to sex and love with robots, "the ethical issues on how to treat them are something we'll have to consider very seriously, and they're very complicated issues," Levy said.

Levy successfully defended his thesis Oct. 11.