As I said, up to 1.7% according to at least one (albeit rather criticised) study - https://www.ncbi.nlm.nih.gov/pubmed/11534012 https://www.ncbi.nlm.nih.gov/pub

As I said, up to 1.7% according to at least one (albeit rather criticised) study - https://www.ncbi.nlm.nih.gov/pubmed/11534012 https://www.ncbi.nlm.nih.gov/pubmed/11534012 The criticisms are more about terminology than the core argument though - they mostly argue that "intersex" should only cover a small number of conditions that result in an arbitrarily substantial differentiation from a "normal" male or female, rather than any significant differentiation. So if the question is about sexual dimorphism, those criticisms are mostly irrelevant. But here's a question: why is it important that they can reproduce? Gay men and women are unlikely to reproduce either, so should we ignore them in policy-making too? Are gay people abnormal?