Nova: Welcome to Aibrary. I'm Nova, and today we're diving into a book that takes us to one of the busiest border crossings in the world: Tijuana, Mexico. The book is called Sex Work and the City: The Social Geography of Health and Safety in Tijuana, Mexico, written by anthropologist Yasmina Katsulis and published in 2008 by the University of Texas Press. Now, before you think this is just another academic tome, let me give you a number that stopped me cold: seven. That is the youngest age at which Katsulis documented someone entering sex work in Tijuana. Seven years old.

Nova: It's all of those things, but at its core, it's an ethnography. Katsulis spent eighteen months doing intensive fieldwork in Tijuana, conducting nearly 400 interviews with sex workers, customers, city officials, police officers, health providers, and advocates. She talked to female, male, and transgender sex workers. She wanted to understand not just who these people are, but how the city itself, its laws, its geography, its economy, shapes their risks and their choices. The subtitle tells you everything: The Social Geography of Health and Safety. This is a book about how where you work and what your legal status is determines whether you live or die.

Nova: Exactly. And that's what makes this book so powerful. Katsulis frames sex work as an occupational health issue. She asks: what are the working conditions? Who gets hurt? And critically, who does the hurting? Spoiler alert: it's often not who you'd expect. Let's get into it.

Nova: So before we can understand the sex industry in Tijuana, we have to understand Tijuana itself. Katsulis dedicates two full chapters to this. Tijuana sits at the busiest international crossing point in the world. It's a city shaped by massive migration flows, by American economic and immigration policies, by NAFTA, by the drug war. People from all over Mexico and Central America pour into Tijuana, many hoping to cross into the United States. But a lot of them get stuck.

Nova: They can't cross. Border enforcement tightened dramatically in the 1990s and 2000s. So you have this growing population of migrants with limited economic options, in a city that has become a hub for tourism, for manufacturing through maquiladoras, and yes, for the sex trade. Katsulis points out that while the majority of clients in Tijuana's sex industry are local residents and migrant workers, the city also draws customers from the US, Canada, Europe, and Asia.

Nova: That's exactly right. And here's a key detail that sets up the whole book: in Mexico, there are no federal laws regulating sex work. None. Instead, each local jurisdiction decides how to handle it. About thirteen Mexican states have some form of regulation. In Tijuana, the city created a system where sex workers can register with the municipal government, get a health card, and work legally in certain zones. On paper, this sounds like a public health measure. In practice, Katsulis shows us, it creates a two-tiered system that leaves the most vulnerable workers in the shadows.

Nova: It changes everything. And here's the kicker: in Katsulis's study, of the 140 female sex workers she surveyed, only 33 were registered. That's less than a quarter. The other 107 were unregistered. And the reasons they couldn't register tell you a lot about how the system actually works.

Nova: Chapter three of the book has this unforgettable title: Milk Money, Drug Money, and the Sexual Entrepreneur. And it gets at something really important. Katsulis refuses to flatten sex workers into one category. She shows us that people enter sex work for vastly different reasons, and those reasons shape everything about their experience.

Nova: It does. Some of the women Katsulis interviewed were mothers. They did sex work to afford basic necessities for their children. Milk, food, school supplies. These are not people chasing luxury. They're meeting survival needs. And Katsulis is careful to show that this is a rational economic strategy in a context of extremely limited options. These women are not passive victims. They're making calculated decisions in a brutal economic landscape.

Nova: Right. Some workers, particularly those on the streets, use sex work to support drug addiction. Katsulis found that drug-addicted sex workers have the hardest time negotiating safer sex because refusing a client's demands means losing income they need immediately. The urgency of addiction undermines their bargaining power. And this is where the book gets really nuanced. Katsulis doesn't moralize about drug use. She treats it as a health issue that intersects with occupational safety.

Nova: This is the category that challenges stereotypes the most. Some sex workers Katsulis met saw themselves as entrepreneurs. They invested in their appearance, built regular client bases, and used sex work as a strategy for social mobility. Some were putting themselves through school. Others were saving to start businesses. Katsulis found that youth sex workers, in particular, used their earnings to buy cell phones, computers, trendy clothing. They were participating in consumer culture, constructing identities, building what sociologists call symbolic capital.

Nova: Exactly. And Katsulis's point is that none of these motivations exist in isolation. A single person might move between them over time. The important thing is that policy needs to account for this diversity. A one-size-fits-all approach, whether it's criminalization or regulation, will fail people whose circumstances don't fit the mold.

Nova: This brings us to the heart of the book: chapter five, Legal Status and Policing. This is where Katsulis's argument becomes devastating. She shows that the very system designed to regulate sex work and protect public health actually creates the conditions for violence and exploitation.

Nova: In theory, yes. Registered sex workers get health cards. They're supposed to get regular STI screenings. They can work in designated zones without fear of arrest. But here's the problem: to register, you need documentation. You need to be of legal age. You need money for the fees and the health exams. If you're underage, if you're an undocumented migrant, if you're transgender and your documents don't match your identity, if you're too poor to pay the fees, you can't register. So the people who are already the most vulnerable are forced to work illegally.

Nova: This is the darkest finding in the book. Katsulis documented that police in Tijuana were not protecting unregistered sex workers. They were preying on them. Police violence, extortion, and even rape were common experiences for the unregistered workers she interviewed. Police would demand money, demand free sexual services, threaten arrest or deportation. And because the workers were operating outside the law, they had no recourse. They couldn't report the abuse without incriminating themselves.

Nova: That's exactly what Katsulis found. And it gets worse. Even registered workers weren't fully protected. Police would sometimes harass them anyway, claiming they were working outside their designated zone or that their paperwork wasn't in order. The registration system gave police another tool for extortion. Katsulis quotes workers who described the police as their greatest occupational hazard, worse than violent clients, worse than disease.

Nova: And that's why this book is so important. Katsulis's data showed that two factors were the strongest predictors of workplace violence: soliciting clients outdoors and experiencing housing insecurity. Not drug use, not age, not gender identity. Where you work and whether you have a stable place to live. Those are structural factors, not individual behaviors. And both are directly shaped by legal status and policing.

Nova: One of the most groundbreaking aspects of this book is that Katsulis didn't just study female sex workers. She included 42 male sex workers and 16 transgender sex workers in her survey. At the time, this was almost unheard of in public health research on sex work, which tended to focus almost exclusively on women.

Nova: Katsulis addresses this directly in her preface. She writes that HIV/AIDS research funding has historically concentrated on female prostitution and male homosexuality, and that this has reinforced stereotypes about who is dangerous and who needs to be controlled. By including male and transgender workers, she disrupts those categories. She shows that gender and sexual orientation are far more complex than the public health establishment tends to acknowledge.

Nova: They faced distinct challenges. Transgender workers, in particular, occupied the most precarious position in the social hierarchy. They experienced the highest levels of police harassment, the most difficulty accessing health services, and the greatest social stigma. Many couldn't register because their identity documents didn't match their gender presentation. Male sex workers, meanwhile, often operated in completely different spaces from female workers, with different client expectations and different risk profiles.

Nova: Katsulis found that 59 of the 197 workers she interviewed had started before age 18. The youngest age of entry was 7. These youth described themselves not as victims but as survivors, as strategic actors. One 15-year-old named Roberto told her he saw himself as a role model for other street kids. He said, I did not steal. I told them, give pleasure and charge for it. Katsulis argues that we need to hold two truths at once: these youth are victims of structural violence, of poverty and broken systems, but they are also agents making choices within severely constrained circumstances. Neither the victim narrative nor the empowered entrepreneur narrative fully captures their reality.

Nova: It is. And Katsulis doesn't resolve it. She lets it sit there, because that tension is the truth.

Nova: So after all this research, what does Katsulis actually recommend? Her conclusions chapter is remarkably clear-eyed. She argues that the current system in Tijuana, this quasi-legal registration model, doesn't work. It creates a two-tiered hierarchy where the most vulnerable workers are pushed into the most dangerous conditions.

Nova: Katsulis leans toward a harm reduction framework. She draws on models that have worked in other contexts, like needle exchange programs for drug users. The idea is: you may not be able to eliminate the activity, but you can dramatically reduce the harm associated with it. For sex work, this means decriminalizing the trade so workers can report violence without fear of arrest. It means making health services accessible regardless of legal status, age, or gender identity. It means addressing the structural factors, poverty, housing insecurity, migration policy, that push people into the most dangerous forms of sex work in the first place.

Nova: Katsulis is blunt about this. She argues that police reform is essential. As long as police have the power to arrest, extort, and assault sex workers with impunity, no regulatory framework will keep workers safe. She also calls for sex workers themselves to be included in policymaking. In Tijuana, there was a sex workers' union, and Katsulis found that workers involved in the union had better outcomes. They had more information, more bargaining power, more protection. Worker organizing matters.

Nova: That's exactly her argument. And she's careful to note that this isn't about endorsing or condemning sex work. It's about recognizing that sex workers exist, that they are human beings with rights, and that policies designed to control or eliminate them almost always end up hurting them more. She writes in her preface that she approached the study with the hypothesis that sex workers were likely more aware of sexual risks and more skilled at negotiating safety than their non-sex-worker peers. And the data bore that out. The danger doesn't come from the work. It comes from the stigma, the criminalization, the poverty, and the violence of the state.

Nova: Sex Work and the City is not a comfortable book. It takes you into the lives of people who are systematically marginalized, and it forces you to see them not as symbols or statistics but as full human beings making difficult choices in impossible circumstances. Yasmina Katsulis gave us something rare: an ethnography that is both rigorously academic and deeply humane.

Nova: That's the takeaway. Katsulis shows us that if we actually want to reduce harm, we need to stop moralizing and start listening. Listen to sex workers about what they need. Address the structural conditions that make them vulnerable. And recognize that criminalization, even when it's dressed up as regulation, is not protection. It's a mechanism of control that hurts the people it claims to help.

Nova: They really are. And that's why this book remains essential reading, not just for anthropologists or public health researchers, but for anyone who wants to understand how law, geography, and power shape who gets to be safe and who doesn't. Sex Work and the City is ultimately a book about inequality, about borders both literal and metaphorical, and about the human cost of policies that prioritize control over care.