Meet April.

She’s 153cm tall, has blonde hair, big breasts and is one of three sex dolls 58-year-old James, takes to bed.

James, from Atlanta, Georgia, bought April when his wife of 36 years began taking care of her sick mother.

They now have sex up to four nights a week and his wife, Tine, has said she’s become used to having the dolls around.

James and Harmony. (Channel 4)

"If he really wanted to he could have gone out and found someone else but he didn't do that, he was true to me,” she said.

James explained that being with the doll is like “having sex with a real woman” and said it was a “fantasy”.

But he doesn’t only use April for sex, he also takes her out on dates.

"When I take April out it's usually to a hamburger place where we can stop and get a bite to eat, a lot of people don't even notice she is not a breathing person.”

Having already bought three sex dolls at what works out at around A$3,500 each, James is saving up to buy Harmony, a $14,000 robotic sex doll who can interact with him while they are making love.

James and April feature in Channel 4’s new documentary ‘The Sex Robots are Coming’, which follows a manufacturer’s attempt at creating a fully functional, artificially intelligent sex robot.

Sex robot, Harmony, in the making. (Channel 4)

James is saving up to buy a sex robot. (Channel 4)

Matt McMullen, CEO and Creative Director of Realbotix, also features in the documentary, and told Channel 4 Harmony is not just about the sex.

“She is equipped with varying levels of Artificial Intelligence and she is capable of sex, but it’s a robot that’s designed to have that as one of its functions.”

Mr McMullen explained customers buying Harmony can choose favourable personality traits and are able to customise her voice.

“Its main function is companionship and conversational context – being able to have a conversation with an AI or a robot is rally the primary function – but insofar as human relationships go, it’s kind of designed to be an alternative to that – it’s a new form of interaction that didn’t exist before.”

McMullen explains his company has also begun manufacturing male robots, who will have gender-specific traits.