Chinese sex doll factories have reported booming business thanks to the installation of AI chatbots, with creepy pictures showing the realistic toys being manufactured.

Disturbing images lay bare how the process of mass producing realistic sex bots has progressed over recent years, with basic silicone dolls seen next to anthropomorphic robots.

WMDoll, one of China's biggest sex doll makers, has said it is expecting a record 30 per cent jump in sales this year thanks to its adoption of generative AI tools like ChatGPT.

'It makes the dolls more responsive and interactive, which offers users a better experience,' the company's founder and chief Liu Jiangxia told the South China Morning Post.

Unlike traditional sex dolls, those installed with AI capabilities are designed to speak back to the user.

WMDoll says it can make dolls with about eight different 'personalities' to choose from, which are capable of continuing a conversation started a few days earlier. 

The company fits its dolls with an AI tool which is designed to pander to its partner's ego and which can be programmed to ask questions about their 'relationship' and about the user's feelings.

'In the past, these dolls' primary function was to satisfy users' sexual needs,' Jiangxa said. 'But as their physical features such as head and joint movements and skin became more realistic, our customers started to seek emotional companionship in the dolls.'

WMDoll fits its dolls with an AI tool which is designed to pander to its partner's ego

A worker assembles a sex doll at the WMDOLL factory in Zhongshan, Guangdong Province, China

Spanish customers prefer robots with darker skin, full lips and larger genitals. Around 70 per cent of these customers also like hair on genitals. Pictured is a worker assembling sex dolls

Unlike traditional sex dolls, those installed with AI capabilities are designed to speak back to the user

This photo taken on February 1, 2018 shows robots in a lab of a doll factory of EXDOLL, a firm based in the northeastern Chinese port city of Dalian

Disturbing images give an insight into China's strange sex robot factory where people can order custom-made AI dolls, some of which are the size of children. Pictured is a vendor and costumer in the shop in Guangzhou Adult Market in Guangzhou

She said that was when the firm decided to introduce large language models into its products, allowing the dolls to 'react to users verbally'.

The company started used AI in its dolls in 2016 and the technology has been improving thanks to open source AI, which has helped to make them cheaper.

Dolls are often made with thermoplastic which is heated to 37C to reflect a human's body temperature and developers say these perverse dolls have body sensors that also make them feel human-like.

Another manufacturer, Shenzhen Atall Intelligent Robot Technology based in Shenzhen, Guangdong Province, previously said that most of its clients are 40 to 50-year-old men that come from Europe and the US.

Users can order custom-made AI dolls which cost around $3,000 (£2,000) each and have soft and elastic skin made from rubbery plastic that contain less oil content than normal plastics and do not smell.

US customers are said to like dolls with darker skin and large breasts, buttocks and genitals while Chinese customers go for for Asian features with small, hairless genitals, the company said. 

Most shockingly, the firm is selling child-size AI sex robots, both male and female, and the biggest market for them is reportedly in the US and Canada.

However, the perverse fetish for child-like dolls is nothing new, with police raids around the globe in recent years leading to dolls being seized and perverted users arrested. 

The robots' bodies are made from modified thermoplastic elastomers (TBE) with a metal skeleton and they are around half the weight of normal human beings.

The company says they have anti-electric shock, anti-fire and anti-explosion measures. 

 Pictured are bodies of the 'smart' sex dolls hanging to dry in dolls factory in Dongguan, Guandong Province

Pictured is a user holding a hand of his 'smart' sex doll as he sits on a sofa in his home in Guangzhou

Pictured is a worker assembling a doll in dolls factory in Dongguan

The robot's eyes, lips and head move and they speak English and Chinese, developers say.

Flexible joints mean the dolls can be positioned in a variety of poses for display as well as sexual acts. 

The company also produces custom-made AI sex robots which sell for $9,400 (£7,000).

So far two have been ordered by men who wanted them based on the image of their wife who had passed away.

Around 70 per cent of these customers also ask for hair on the dolls' genital area. 

Male sex robots are also sold but they are nine times less popular than female robots, according to manufacturers. 

Pictured is the electronic skull of a robot. Companies can charge thousands for dolls, depending on how sophisticated they are

 A worker hangs dolls' bodies to dry and checks them in sex dolls factory in Dongguan

Dolls are often made with thermoplastic which is heated to 37C to reflect a human's body temperature 

Heads of 'smart' sex dolls on display in dolls factory in Dongguan, China

A worker paints make-up on dolls' faces in sex dolls factory in Dongguan, Guandong Province 

Sex robots have long been a part of science fiction, and are often used by writers to show the menacing side of technology

A man, pictured, assembles stainless steel skeleton for a sex doll in the mould in dolls factory in Donggua

On Chinese social media, some say the products reinforce sexist stereotypes or endorse paedophilia.

'When sex robots become more technologically advanced, will men prefer to use them instead of respecting human wives?' one commenter on the Twitter-like Weibo platform wrote.

Meanwhile others, calling themselves 'friends of dolls', share user reviews and advice on dedicated online forums.

'The material is quite good, very soft to the touch. When I hold her I feel very comfortable,' one anonymous user said in a review of a standard sex doll on e-commerce platform Taobao.

China has previously been estimated to make more than 80 percent of the world's sex toys, with over a million people employed in the country's $6.6 billion industry.

Prominent Chinese feminist Xiao Meili thinks that some men will always have outdated expectations and 'sex housewife robots' might actually help women.

'A lot of men want the same for women: sex, housework, childbirth and filial piety. They don't think of women as individuals,' Xiao told AFP.

'If every nerd buys a sex doll for himself... that would free a lot of women from these kind of men.'