The comparison between intersex variations (DSDs) and rare developmental anomalies like conjoined twins oversimplifies the issue and misses the biological and social relevance of sex diversity.
Intersex people (those with Differences of Sex Development) aren't just “abnormalities” they are natural variations in human sex characteristics. While not the statistical majority, intersex individuals occur at similar rates to people born with red hair or green eyes estimates range from 1 in 1,500 to 1 in 2,000 for some types, with broader definitions suggesting up to 1.7% of the population.
The argument isn’t that most people aren’t male or female. Rather, it’s that sex isn’t strictly binary because biology doesn't adhere to neat binary categories. Chromosomes (XX, XY, XXY, XO, etc.), hormones, gonads, and genitalia don’t always align in a binary way. Some people are born with ambiguous or mixed characteristics that don’t fit neatly into "male" or "female."
In contrast to something like having two heads, intersex traits impact how we define, classify, and legislate sex especially in medicine, sports, legal documentation, and human rights. If the binary model doesn’t account for all real human variation, then the model is incomplete, not the people.
To say “sex is not binary” is not to say “male and female don’t exist.” It’s to say that not everyone fits neatly into those two categories, and biology acknowledges that.
I hope this helps 😁