It may sound like a line from sci-fi porn film, but according to one author, sex will be "on tap" in the future.

David Levy, author of Sex with Robots: The Evolution of Human-Robot Relations, has said that robots are destined to provide humans with sexual gratification, and will become so lifelike that we may even find ourselves falling in love with them.

"Already today, the best quality synthetic voices cannot be distinguished from human voices," he told Agence France-Presse.

He added that it wasn't only men who would be drawn to the idea of "sex on-tap", revealing that women may be even more enthusiastic about the concept.

"I don't think that women will be any less attracted than men - they may be more attracted."

Levy predicted that the onslaught of robots for sex was imminent.

"It is only a matter of time before someone in the adult entertainment industry, which is awash in money, thinks, 'Gee, I could make a pile of money'."

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