California-based Abyss Creations is building a range of silicone sex dolls that not only look like real women but move and speak like them too .

The dolls are fully customisable, from their eyes and hair to their breasts and genitalia. There are 14 different styles of labia and 42 different nipple options.

They can even be made in the image of real people. Some customers reportedly send in pictures, or even bring their wives or girlfriends to the workshop to get exact replicas made.

An app called Harmony 2.0 allows the user to tailor their RealDoll's "personality" by selecting from 18 traits - including happy, shy, s£nsu@l, funny, jealous, moody and talkative.

Turn up the intellectual setting and it may even recite poetry or engage in witty banter.

"The AI will learn through interaction, and not just learn about you, but learn about the world in general," RealDolls creator, Matt McMullen, told The Guardian.

"You can explain certain facts to her, she will remember them and they will become part of her base knowledge."

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While some suggest they could replace prostitutes, others see them as potential companions for people who are socially isolated or struggle to form human relationships.