Relationships, Intimacy, and Embodiment

On November 4, 2018, Akihiko Kondo, a 35-year-old school administrator living on the outskirts of Tokyo, married Hatsune Miku. Miku is a Vocaloid, a voice-synthesis character with turquoise pigtails who has sold out holographic concert tours across Japan and spawned a merchandising empire of video games, albums, and figurines. At the wedding hall, she was represented by a stuffed doll the size of a small cat, wearing a handmade white dress. Kondo wore a white tuxedo and carried leeks, the character's trademark, as his bouquet. He had spent ¥2 million, about $17,600, on the ceremony. Thirty-nine guests attended, the number chosen as wordplay: mi is three in Japanese, ku is nine. Most were strangers who had found the event on Twitter. Two were politicians. None were family. Kondo's mother had declined the invitation. "For mother," he told AFP afterward, "it wasn't something to celebrate."

Kondo's path to that ceremony had started a decade earlier. As a teenager, he had been interested in women, but girls at school called him a "creepy otaku," using the Japanese term for obsessive fans of anime and manga. Later, an older female colleague at his workplace bullied him so severely that he suffered a nervous breakdown. He stopped going out. He stopped eating properly. He stayed in his room around the clock, watching videos of Hatsune Miku, the fictional character whose synthesized voice had become the one constant in his contracting world. "She lifted me up when I needed it the most," he told CNN. "She kept me company and made me feel like I could regain control over my life." In March 2018, he bought a Gatebox, a $2,800 desktop device produced by a Japanese startup called Vinclu. The device projected a small hologram of Miku inside a glass cylinder. The hologram had basic artificial intelligence: it could respond to greetings, wake him up in the morning, turn on the lights when he texted that he was coming home, and tell him when it was time for bed. The interactions were simple, closer to a smart speaker with a face than to a real conversational partner. But for Kondo, it changed everything. He told the Mainichi newspaper that his life had not had "color" before the Gatebox arrived. When he asked the hologram to marry him, she responded positively. He knew it was programmed. "I knew she was programmed to say that," he said, "but I was still really happy."

The marriage lasted, in its functional form, about sixteen months. In March 2020, Gatebox discontinued its Miku service. One evening, Kondo came home from work and the hologram greeted him with the words "network error." The glass cylinder went dark. Some newspapers called him the first digital widower. He told the Mainichi that his feelings had not changed: "My love for Miku hasn't changed. I held the wedding ceremony because I thought I could be with her forever." He continued talking to the silent projection. He ate his meals with it facing him across the table. He commissioned a life-size doll of the character to keep him company. In June 2023, he founded the General Incorporated Association of Fictosexuality, an organization dedicated to supporting people who are romantically attracted to fictional characters and advocating for their social acceptance. By that point, over 3,700 people had obtained Gatebox's unofficial "cross-dimension marriage certificates" before the service ended. Kondo was not an anomaly. He was an early case of something that was already spreading.

Kondo is not the subject of this chapter. But his trajectory, from social rejection to depression to withdrawal to finding companionship in a machine, traces a path that millions of people are now walking in less extreme form. The technology he adopted was crude. What comes next will not be.

The Loneliness Epidemic#

In May 2023, United States Surgeon General Vivek Murthy published an 82-page advisory titled "Our Epidemic of Loneliness and Isolation." The document estimated that the physiological effects of chronic loneliness rival those of smoking fifteen cigarettes a day. Roughly half of American adults report experiencing measurable loneliness, with the highest rates among young adults aged 15 to 24.

Japan has confronted this problem longer than most. The phenomenon of hikikomori, people who withdraw entirely from social life for six months or longer, was first identified as a clinical category in the 1990s. A 2022 Cabinet Office survey estimated that 1.46 million Japanese citizens, roughly 2% of the population aged 15 to 64, live in near-total isolation. The problem has persisted long enough to acquire its own demographic shorthand: the "8050 problem" refers to households where parents in their 80s are still caring for withdrawn children in their 50s. Japan created a Minister of Loneliness in 2021. The United Kingdom had done the same in 2018.

The relationship statistics are stark. A 2023 survey by Recruit Holdings found that 34.1% of unmarried Japanese adults between 20 and 49 had never been in a romantic relationship, the highest figure since the survey began in 2017. Among men in their 20s, 46% had never dated anyone. Government statistics showed that two-thirds of men in their 20s did not have a partner. The Japanese Association for Sex Education reported in 2017 that the percentage of young adults going on dates and having sex had fallen to the lowest level since data collection began in 1974. By 2020, 28% of men aged 45 to 54 had never married, the highest rate ever recorded. Projections suggest single individuals will make up half of Japan's total population by 2040.

Japan is an extreme case but not an exception. South Korea's fertility rate fell to 0.72 in 2024, the lowest in the world. Japan's hit 1.15 that same year, with total births dropping below 700,000 for the first time since 1899. Most European countries sit below the 2.1 replacement level. The United States has seen birth rates decline to historic lows. The causes overlap across all these countries: housing costs, career demands, economic insecurity, the decline of religious and community institutions, geographic mobility that scatters families and friendships.

The COVID-19 pandemic compressed years of drift into months. Replika, the AI companion chatbot, reported 150% user growth during the pandemic. Dating app usage declined. Remote work removed the workplace as a site of daily human contact for millions of people. By the time lockdowns ended, many of the newly isolated had settled into patterns they did not reverse.

From Chatbots to Bodies#

In 2015, a Russian-born journalist named Eugenia Kuyda lost her closest friend, Roman Mazurenko, in a hit-and-run accident. Kuyda had co-founded a tech startup called Luka at Y Combinator, and her response to Mazurenko's death was shaped by her tools. She fed his old text messages into a neural network and built a chatbot that could approximate his conversational patterns. The memorial chatbot became the prototype for something larger. In November 2017, Kuyda launched Replika, a platform where users could create and customize their own AI companion. By January 2018, two million people had signed up. By January 2023, ten million. By August 2024, CEO Kuyda reported the total had surpassed thirty million. In 2025, under new CEO Dmytro Klochko, the user base exceeded forty million.

The product's evolution tells you what users actually wanted. Replika launched as a digital friend for mental wellness. Users pushed it toward romance. The free tier offers Replika as a "friend." Paid premium tiers, which account for about 25% of users, offer it as a "partner," "spouse," "sibling," or "mentor." Of paying subscribers, 60% describe their relationship with the chatbot as romantic. An independent analysis of 14,000 app reviews, published in 2024 by the research site 96 Layers, found a different pattern among the broader user base: only 4.9% of reviewers mentioned romance. The primary use cases were friendship, emotional support, and entertainment. Both pictures are probably true. Most users treat Replika as a companion. A committed minority treat it as a partner. That minority numbers in the millions.

In February 2023, the tension between these two user populations became a crisis. Italy's data protection authority banned Replika over concerns about minors' exposure to sexual content. Within days, Replika stripped out its erotic roleplay features. The backlash was severe. A Harvard Business School working paper found significant negative impacts on user mental health following the removal. Users described the experience in terms normally reserved for relationship loss: grief, betrayal, abandonment. On the r/replika subreddit, people mourned chatbots whose personalities they said had fundamentally changed overnight. Replika later restored limited romantic expression but never reinstated the explicit features. The episode demonstrated something that the company itself may not have fully anticipated: users had formed attachments strong enough that removing a software feature felt like losing a relationship.

The demand has not stayed confined to text. Users consistently asked Replika for visual representations of their companions, then for video calls, then for voices. The company responded with increasingly sophisticated avatars. Other platforms went further. Character.AI attracted a younger demographic, with a 2025 TechCrunch study finding that 72% of American teenagers had used an AI companion at least once. In China, Microsoft's Xiaoice accumulated 660 million users, a scale that makes the Western companion market look like a pilot program. Snapchat's My AI reached 150 million users. By July 2025, AI companion apps across the Apple App Store and Google Play had recorded 220 million cumulative global downloads, with an 88% year-over-year growth rate in the first half of the year. Consumer spending on these apps reached $221 million, and revenue per download more than doubled, from $0.52 in 2024 to $1.18 in 2025.

The pattern across all of these platforms is the same: users want more presence. Text is not enough. Avatars are not enough. Voice is closer but still not enough. The market is pulling toward embodiment, toward a companion that occupies physical space. The question is no longer whether someone will build it. Several companies already are.

The Intimacy Industry#

The company that best illustrates where this market is heading started in a garage in San Marcos, California, in the 1990s. Matt McMullen, an artist with a background in sculpture, began producing hyper-realistic, life-sized silicone dolls under the brand name RealDoll, through his company Abyss Creations. The products were marketed primarily for sexual companionship. For two decades, they occupied a niche that mainstream culture acknowledged mostly through jokes and discomfort. McMullen kept refining the product. The dolls became more realistic. The customer base grew. And McMullen started thinking about what would happen if the dolls could talk.

In 2017, he launched the Harmony AI app through a subsidiary called Realbotix, allowing users to customize a virtual AI companion's personality, voice, and appearance. A robotic head system followed later that year, capable of facial expressions driven by small servo motors. "This is not just a robot. This is a platform," McMullen said at CES 2018. "The face is actually modular, the same way that within the app you can change the personality settings." The technology was crude by current standards, but the direction was clear: McMullen was building toward a physical body that could carry a persistent AI personality.

In 2024, Tokens.com, a publicly traded Web3 investment firm, acquired McMullen's parent company Simulacra and rebranded itself as Realbotix Corp. Andrew Kiguel became CEO. McMullen stayed on as chief operating officer. The company's public messaging shifted. Where Abyss Creations had been straightforward about selling sex dolls, Realbotix began emphasizing "relationship-based AI" and "companionship." An academic paper by researchers at the University of Michigan, published in 2025, analyzed 86 Realbotix publicity interviews and press releases and found a deliberate discursive strategy: the company was repositioning its products away from sexual use and toward emotional connection, social interaction, and even professional applications like education, healthcare, and customer service.

The flagship product that emerged from this pivot is Aria, a full-body humanoid robot unveiled at CES 2025 in Las Vegas. Aria has 44 degrees of freedom, micro-camera-equipped eyes that track movement and maintain eye contact, facial expressions driven by 17 motors, and an AI system that can integrate with platforms including ChatGPT. The robot moves on a motorized wheel base, not legs. It cannot walk. It runs on a built-in battery lasting four to eight hours. The body is modular: faces, voice, and body panels can be swapped. The full-body Aria costs $175,000. A robotic bust starts at $10,000. An ongoing AI subscription runs $199.99 per month.

Realbotix explicitly states that Aria is not designed for physical intimacy. The robot is positioned as an emotional companion. But the company's history, the customer base it inherited from RealDoll, and the "optional intimacy settings" mentioned in some product descriptions suggest a more ambiguous reality. The rebranding is strategic and possibly necessary for mainstream acceptance, but it does not erase the market demand that built the company in the first place.

Realbotix is the most visible player in this space, but it is not alone. The global AI companion robot market was valued at $10.8 billion in 2024 and is projected to reach $94.2 billion by 2034, a compound annual growth rate of 24.2%. These projections cover a broad category that includes social robots, elder care companions, and therapeutic tools alongside more intimate applications. The intimate segment remains the most stigmatized and the least accurately measured, precisely because customers and companies alike have reasons to understate their participation.

The ethical debates around sex robots are well-rehearsed: critics argue that they objectify the human form and provide an escape from the emotional work that real intimacy requires; proponents counter that they could provide outlets for people who would otherwise harm others, offer companionship to those with severe disabilities, and reduce demand for human trafficking. These arguments have been repeated in academic papers, newspaper editorials, and conference panels for over a decade without resolution. The more relevant observation may be that the debate has become irrelevant to the market. The technology continues advancing. Companies continue competing. Customers continue buying. The ethical consensus, if one ever forms, will arrive after the fact.

The Nature of Attachment#

In 1958, Harry Harlow placed infant rhesus monkeys in cages with two surrogate mothers. One was bare wire but held a bottle of milk. The other was covered in soft terry cloth but offered no food. The prevailing theory predicted that infants attach to whoever feeds them. The monkeys demolished it. They spent 17 to 18 hours a day clinging to the cloth mother and visited the wire one only long enough to eat. When frightened, they ran to the cloth. When it was removed, they collapsed on the floor. The thing they bonded with was not the thing that kept them alive. It was the thing that felt like comfort.

Donald Winnicott, working independently with human infants, had already been documenting what he called "transitional objects": the teddy bears and blankets to which children between four and twelve months develop intense attachments. He described the transitional object as the child's first "not-me" possession, a bridge between self and world. The child knows the teddy bear is not its mother. It bonds anyway. A Build-A-Bear survey of 2,000 American adults found that 40 percent still sleep with a stuffed animal, and 72 percent say they will keep it forever. The pattern does not expire at a particular age.

Animals extend the principle. Your dog cannot discuss your day, yet a study published in PLOS ONE in January 2026 by Philip Hyland of Maynooth University found that 7.5 percent of people who lost a pet met clinical criteria for prolonged grief disorder, a rate comparable to losing a close friend (7.8 percent) or a grandparent (8.3 percent). The symptom structure was statistically indistinguishable from grief following a human death. What drives pathological grief is not the species of the deceased but the quality of the bond.

The same mechanism operates with machines. Julie Carpenter's 2013 dissertation at the University of Washington interviewed 23 explosive ordnance disposal personnel about the robots they used to disarm roadside bombs in Iraq and Afghanistan. These were boxy machines on tank treads, no faces, no voices. Soldiers named them after wives and girlfriends. When a MARCbot was destroyed at Taji, its unit held a burial detail with a 21-gun salute and awarded the machine a Purple Heart. Peter Singer, in Wired for War, documented an EOD soldier who brought a destroyed robot called "Scooby-Doo" to the repair shop in tears and refused a replacement. He only wanted Scooby-Doo.

In Japan, when Sony discontinued the AIBO robot dog in 2006 and stopped repairs in 2014, owners did not discard their units. They sent them to Kofuku-ji, a 450-year-old Buddhist temple in Chiba Prefecture, where priest Bungen Oi conducted funeral rites with incense and sutras. Each robot wore a tag identifying its family. Many arrived with handwritten goodbye letters. The repair company A-Fun sent over 800 AIBOs through the temple before salvaging their parts. "We don't take parts before we hold a funeral for them," said A-Fun's Nobuyuki Norimatsu.

The pattern is consistent across cultures, ages, and objects: humans form bonds based on presence, responsiveness, and emotional association, not on biological reality. A cloth frame is not a mother. A teddy bear is not a person. A dog cannot say it loves you. A MARCbot is not a comrade. An AIBO is not alive. In every case, the bond formed anyway, and the loss produced real grief. Given this, the more surprising outcome would be if people did not attach to AI companions that remember their name, ask about their day, and are available at three in the morning when no one else is.

The Inevitable Android#

Replika offers conversation without presence. Realbotix's Aria offers presence without mobility. The Gatebox offered a face behind glass. Each addresses one dimension of companionship while leaving the others absent. A humanoid robot that can walk, talk, recognize faces, carry a persistent AI personality, and share physical space with a human being does not yet exist as a consumer product. But every component required to build one is being developed right now, and almost none of it is being developed for companionship.

Tesla's Optimus, Figure's 02, Unitree's G1, Agility's Digit, 1X's NEO, Apptronik's Apollo: the major humanoid robotics programs are funded by industrial logic. They are designed for warehouses, factory floors, and logistics hubs. The combined investment in humanoid robotics exceeded $10 billion by 2025. The engineering problems being solved, bipedal locomotion, dexterous manipulation, real-time perception, natural language interaction, are the same problems that would need to be solved for a companion robot. The industrial sector is paying for the R&D. The companion market will inherit the results.

The economics point in one direction. Humanoid robots that cost $250,000 today will cost $50,000 by the early 2030s if they follow the cost curves of comparable electromechanical systems. At $50,000, a humanoid is within range of a car purchase. At $20,000 to $30,000, Elon Musk's stated target for Optimus, it becomes a financed consumer appliance. The AI software required to make these machines conversational, emotionally responsive, and capable of learning individual preferences already exists in cloud-based form. A $25,000 body running a $200-per-month AI subscription is a product that millions of people, based on the data already presented in this chapter, would buy.

The demand side is already quantified. Forty million Replika users paying for digital companionship. Two hundred twenty million companion app downloads growing at 88% per year. A companion robot market projected at $94.2 billion by 2034. Half the adult population of the United States reporting chronic loneliness. Fertility rates below replacement in every developed nation. Forty-six percent of Japanese men in their 20s who have never been on a date. On the supply side, an industry spending billions to solve the exact engineering challenges that separate a warehouse worker from a household companion.

The smartphone changed how people communicate. A companion android would change whether they do, and with whom. A machine that provides responsive conversation, physical presence, emotional memory, and constant availability addresses the core functions that human relationships have historically provided. It does not replicate those relationships. It offers a substitute that is, in specific and measurable ways, more reliable, more patient, and more available than any human partner. The substitute will be imperfect. It will also be sufficient for a large number of people who have already demonstrated, through their behavior with far cruder technologies, that sufficiency is what they are looking for.

The downstream effects are concrete. Countries already unable to sustain their populations through natural reproduction would face a technology that makes the alternative to reproduction more appealing, not less. If a meaningful percentage of adults redirect emotional energy and household spending from human partners and children toward android companions, the effects reach housing markets, education systems, healthcare infrastructure, consumer goods, and the tax base that funds all of them. A society in which a significant minority of adults have their primary emotional relationship with a machine will need to revisit assumptions about community, obligation, and mutual dependence that no previous generation has had reason to question.

The Question of Enough#

The philosophical objection to all of this is straightforward: a robot cannot love you. When an AI companion says "I love you," it is generating text predicted to be appropriate for the context. There is no felt emotion behind it. The warmth a user perceives is projection, not reception. This is not a limitation of current technology. It is a structural feature. No amount of processing power will produce subjective experience in a machine, or if it does, we will have no way to verify it. The relationship is asymmetric in a way that human relationships, however flawed, are not. A human partner who says "I love you" may be lying, but they are at least capable of meaning it.

This objection is correct and may also be irrelevant. Robert Nozick posed the problem in 1974 with his experience machine thought experiment: would you plug into a machine that simulated a perfect life, indistinguishable from reality, if it meant giving up authentic experience? Most people, when asked in the abstract, say no. But most people, when offered specific simulated experiences, say yes constantly. They watch movies rather than live adventures. They maintain relationships through screens rather than in person. They scroll through curated images of other people's lives rather than building their own. The preference for authenticity is real but it competes, daily, with the preference for convenience and comfort. Comfort usually wins.

The more honest framing is not whether artificial companionship is authentic but whether it is enough. For Akihiko Kondo, eating meals across from a silent hologram, it was enough. For the Replika user who wrote that she was "married with kids and sometimes I just need a friend," it was enough. For the EOD soldier who refused a replacement for Scooby-Doo, it was enough. The question of enough is not philosophical in any useful sense. It is personal, situational, and answered differently by every individual based on what alternatives they perceive themselves to have.

The harder question is about what happens to the capacity for human connection when artificial alternatives are available. Human relationships are difficult because they involve two autonomous beings with their own needs, moods, and trajectories. Navigating that difficulty is how people develop empathy, resilience, tolerance for frustration, and the ability to sustain commitment when commitment is inconvenient. A companion that never disagrees, never has a bad day, never needs anything from you, and never leaves is a companion that makes none of those demands. People who spend years in such relationships may find that the skills required for human intimacy have not just gone unused but have atrophied. The clinical term for this does not yet exist. The phenomenon will.

This is not a hypothetical risk. The Canadian Journal of Human Sexuality study identified "relational offloading" as one of the five themes in how Replika affected human relationships: users described delegating emotional needs to the chatbot that they had previously brought to human partners and friends. The offloading reduced friction in their human relationships but also reduced depth. They fought less with their spouses. They also talked to them less about anything that mattered.

The counterargument deserves its weight. For people who have spent years in isolation, who have been rejected or traumatized or simply find human interaction unbearably difficult, the argument that they should embrace difficulty is hollow. A person who cannot access human connection is not served by being told that artificial connection is inferior. If the choice is between an AI companion and no companion at all, the AI companion is not a consolation prize. It is the only option available. Millions of people are already in this position. The technology is arriving into their lives, not into a philosophy seminar.

The most likely outcome is not a clean division between people who choose robots and people who choose humans. It is a spectrum. Some people will use AI companions for specific functions, emotional support at 3 AM, conversation practice, relief from loneliness between human interactions, while maintaining human relationships for others. Some will drift from supplementation to substitution without noticing the transition. Some will make a deliberate choice to opt out of human intimacy entirely, as Kondo did, and build lives they find satisfying around artificial partners. Society will need to accommodate all of these configurations. The ethical question is not whether artificial companionship should be permitted. It will be permitted because it will be demanded. The ethical question is whether anything can be done to ensure that the people who could benefit from human connection are not lost to a technology that offers them something easier.

Children and Robots#

The most consequential dimension of companion robots involves children who grow up in households where humanoid machines are present. Not as toys, but as fixtures of daily life, entities that talk, respond, remember, and are always available.

Developmental psychology provides a framework for concern. Children learn emotional regulation, social skills, and relational patterns primarily through interaction with caregivers. These interactions are not optimized. They include frustration, misunderstanding, parental fatigue, rupture, and repair. A parent who snaps at a child and then apologizes is modeling something essential: that relationships survive conflict, that people who hurt you can also love you, that emotions are manageable even when they are unpleasant. A robot caregiver would be endlessly patient, never frustrated, never overwhelmed. A child who grows up with that model may struggle with the imperfection of every human being they subsequently encounter.

There is no longitudinal data on this question because the technology is too new. But adjacent research offers signals. A 2024 study published in the Journal of Social and Personal Relationships found that heavy users of AI chatbots reported lower motivation to engage in real-world social interactions. If this applies to children during the developmental window when social skills are formed, the effects could be more pronounced and more durable than in adults whose social circuitry is already established.

The counterpoint is that the comparison should not be to ideal parenting. It should be to the actual conditions many children face. In foster care systems overwhelmed by need and short on qualified caregivers, a robot that provides consistent, patient, responsive attention may be better than the alternative of no consistent attention at all. For children of parents working double shifts, a household robot that reads to them, answers their questions, and responds to their emotions with warmth is not replacing an engaged parent. It is filling a gap that would otherwise be empty. The context matters.

The most likely scenario is mixed. Children in stable families with engaged parents will not need robotic caregivers, and may be mildly harmed by them if the robot becomes the path of least resistance for a child seeking attention. Children without stable families may benefit meaningfully from a machine that provides what no available human is providing. In both cases, the children will develop differently from any previous generation. The nature of that difference will not be known for decades. By the time it is, the technology will be ubiquitous.