Jonathan Ned Katz The Invention Of Heterosexuality

Reading Katz on Heterosexuality

The Invention of Heterosexuality by Jonathan Ned Katz was published in 1995 and it basically rewrote how a lot of people think about sexual identity categories. The core argument is that heterosexuality as a distinct identity didn't really exist before the late nineteenth century. Before that, people had same-sex and opposite-sex behaviors, sure, but the framework of calling yourself a "heterosexual" person was just not there. The concept was invented alongside homosexuality as part of the broader medicalization and pathologization of human sexuality. I first encountered this book in grad school, and honestly it was one of those things that made you realize you'd been working with anachronistic vocabulary your whole career. When you're studying historical periods and you casually refer to "heterosexuals" living in 17th century Europe, you're actually projecting a category that simply didn't exist yet. Katz walked through a ton of archival evidence showing that the language and self-understanding of people as types of sexual beings — heterosexuals, homosexuals, bisexuals — was constructed through specific institutional channels: medicine, psychiatry, early sexology, and the legal system. This happened primarily in Europe and America between roughly 1860 and 1920. One thing people often miss is that Katz isn't arguing that opposite-sex desire is somehow unnatural or new. He's making a much more specific claim about identity classification. People have always had sexual relationships with whoever they wanted. What changed was the emergence of a taxonomy that sorted people into categories based on the gender of their partners. This is an important distinction and it's worth holding onto because I've seen the book get misread as the former position way too often.

The methodology Katz uses is pretty rigorous for its time. He traces the etymology of key terms across multiple languages and shows how they migrated from describing behaviors to describing kinds of people. The word "heterosexual" itself appears in German psychiatric literature in the 1860s and then slowly crosses into English medical discourse. By the early twentieth century it was appearing in popular culture and legal documents, and that spread tells you something about how the category was being normalized and enforced. I ran into a specific problem when I was using this framework in my own research on colonial-era Caribbean sexuality. The archive had these court documents from the 1780s that referenced "unnatural acts" involving both same-sex and cross-gender behavior, and I initially coded them using modern sexual identity categories because that was the shorthand my department expected. That was a mistake. Katz's argument made me go back and reframe the entire analysis around behavior and context rather than identity, which turned out to be a much more productive approach. The workaround was essentially to stop asking "who were these people sexually?" and start asking "what did this act mean in this specific social and legal context?" That shifted the whole paper and made it stronger. There are real limitations to Katz's book that readers should know about. It focuses almost entirely on Western Europe and North America. The application of this framework to non-Western sexual histories requires significant revision and supplementary research. Categories like hijra in South Asia or sarissaki in classical Greece don't fit neatly into the heterosexuality/homosexuality binary that Katz describes inventing. Also, some scholars have pushed back on the timing and the degree of novelty he assigns — not everyone agrees that pre-modern people lacked any conceptual vocabulary for sexual orientation at all. There's evidence of nuanced understanding in places like classical antiquity even if it doesn't map onto our modern categories.

If you want to read further on this, Katz has built on earlier work by Michel Foucault and Jeffrey Weeks, and he draws on more recent scholarship by Thomas Laqueur and others who examined how bodies and desires became legible through institutional power. The book is available through University of Chicago Press and various academic retailers. For students and researchers, I'd recommend reading it alongside the collections of essays that respond to and extend his arguments, because the debate itself is where the most interesting scholarship lives. The practical takeaway for anyone working in this area is that sexual identity categories are historically contingent and politically loaded. Using them without acknowledging that contingency tends to produce flatten histories that feel accurate to modern readers but are actually wrong about the past. Katz gave us a tool for catching that error, even if the tool itself has edges and blind spots that need addressing with each new research context.