The possibility of human-robot marriage in 50 years was also the subject of government studies in South Korea and the U.K. “I think it’s crazy, but it is interesting that some people take this seriously,” MacDorman said. He added that building “androids that perform sex” will still prove much easier than building “androids that engage in intelligent conversation.”

But as more robots and virtual companions step out of fantasy into reality, it’s a sure bet that a growing number of people will prove willing to step out with them.

“The main barrier I see is time,” MacDorman said. “With time, all other barriers will be surmounted.”