"An adolescent girl is mocked when she takes a bath with her peers, because her genitals look like those of a boy. A couple visits a doctor asking to 'create more space' in the woman for intercourse. A doctor finds testicular tissue in a woman with appendicitis, and decides to keep his findings quiet. These are just a few of the three hundred European case histories of people whose sex was doubted during the long nineteenth century that Geertje Mak...