You even get a flag to make sure you feel special. (ANGELA WEISS/AFP via Getty Images)

Transsexuals like me never asked to be at the centre of one of the most toxic debates in society; we just wanted to transition and get on with our lives. But what was once a niche medical condition has become a civil rights issue so big that it now challenges our understanding of what it means to be a man or woman.
Transgender ideologues tell us that everybody has a gender identity — an innate and immutable feeling of maleness and femaleness — that determines whether we are women or men, or perhaps something else. If that conflicts with the sex “assigned” to you at birth, then come join us under the transgender umbrella. We will even give you a flag to make sure you feel special.
But what if gender identity is bunkum? To the true faithful who dutifully chant “transwomen are women”, even asking the question is tantamount to blasphemy.
The term “gender identity” was coined by Robert Stoller in 1964. He described it as “a congenital, perhaps inherited biological force”. But evidence is lacking. As Alex Byrne, Professor of Philosophy at MIT, has observed: “If there is some kind of ‘gender identity’ that is universal in humans, and which causes dysphoria when mismatched with sex, it remains elusive.”
Rather like the “luminiferous ether” of the 19th century, a hypothetical substance used to explain the transmission of light, gender identity was invented rather than discovered. But when Einstein showed that ether was unnecessary to explain its existence, that idea was abandoned. Presumably, then, if transsexualism can be explained without a mysterious biological force, gender identity can join it in the history books.
Since the whole debate rests on the distinction between men and women, it makes sense to consider the differences between them. In humans, adult males tend to be taller, while females tend to have wider hips. But the crucial difference — which defines male and female in any species — is the production, or potential for production, of one of two gametes: ova in females and sperm in males.
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