Because women are the only members of the human species that bear children—that is to say, because women bear in themselves the future of humanity—if there is an attempt to change, foundationally and fundamentally, what it means to be human, the attempt will manifest first and most visibly in women. Byrne writes that “what is a woman?” is “the main question” of TWG’s third chapter, and as anyone who pays attention to this discourse knows, that question may be the most volatile question to ask in our current moment. Why doesn’t it occur to Byrne to ask why the definition of “woman” is in contention rather than “man?” Kellie-Jay Keen knows why, as well as the radical feminist philosophers I mentioned above: because the very fabric of who and what we are is at stake.

It is not an overstatement to say that the question of sexual difference, and its counter-concept, gender, is among the most contentiously debated today. We should think about why the topic inspires such vitriol, but one possible reason is that everyone has skin in the game: to be human is to be either a man or a woman, and therefore, being human requires us to think about what it means to be a man or a woman. Every bit of ourselves is expressed either as male or female, and therefore, the questions surrounding sexual difference touch on—or perhaps coincide with—questions of our humanity.

One of the consequences of this, however, has been an absolute morass of once unquestioned terms. On the face of it, this seems silly: there are men and there are women, and we all bring something different to the table when it comes to being human. It shouldn’t be that complicated.

And yet those who pay even the least attention to this discourse (and even perhaps those who wish to pay no attention) know that it is complicated. Part of the reason is that sexual difference is more nuanced than we have previously thought it to be, but another part—probably the larger part—is that the terms of the discourse are intentionally confused and obfuscated by gender ideologues (those who contend that gender is different from sex). Gender ideologues want us to think that sex and gender are much more complicated than most of us can understand, and that the evidence we collect from the world with our own senses (as well as that of the billions of humans who preceded us in history) is not reliable.

Alex Byrne’s Trouble With Gender: Sex Facts, Gender Fictions (TWG) is a mostly successful attempt to cut through the intentional discomposition of the terms of discourse about sexual difference. In an extremely well-researched manner, Byrne addresses many of the “fictions” gender ideologues use to make their arguments. One example: many note that 1.7 percent of the population is intersex, which would mean one out of almost every fifty people have some combination of both male and female genitalia. As Byrne demonstrates in chapter three, that number was made up by Anne Fausto-Sterling in her article “How sexually dimorphic are we?” and that the number is probably 0.015 percent. Such research and clarification alone make the book worth reading.

As Byrne himself writes in both the Introduction and Coda, TWG is a book about sex—not sexual intercourse, but human beings as sexually differentiated creatures. Byrne’s thesis is that “using ‘gender’ to mean anything other than sex is to obscure important issues for no good reason.” In making his argument, Byrne provides a great deal of evidence from biology, history, sociology, and psychology. He carefully sifts through a great deal of nonsense that passes for research in the fairly new subject of “gender studies,” exposing the gender ideologues’ faulty logic. 

On this score, Judith Butler is Byrne’s main target: the title of the book is clearly aimed at Butler’s Gender Trouble, first published in 1990 and largely understood to be a foundational text for gender studies. There, Butler expands on Simone de Beauvoir’s famous proclamation from The Second Sex that “one is not born, but rather becomes, a woman,” and concludes that sex and gender are both socially constructed. Byrne criticizes Butler mostly on grounds of how unclear her writing is rather than any full examination of her first principles. Lack of clarity and precision seem, for Byrne, to be the deepest sin a thinker can commit.

Byrne explores cases of individuals to whom gender ideologues often point to demonstrate that “sex is a vast, infinitely malleable continuum.” These are generally people who have some sort of chromosomal or hormonal abnormality that leads to their being not immediately identifiable as their natal sex, and are thus raised by their parents as the opposite sex (the author makes it clear early in the book that such abnormalities do not result in a “disordered person: indeed, he or she may be the most wonderful human being you could ever hope to meet”).

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