The evolution of the questionnaire in German sexual science: A methodological narrative.

The sexological research questionnaire, which became a central research tool in twentieth-century sexology, has a methodological-developmental history stretching back into mid-nineteenth century Germany. It was the product of a prolonged, disruptive encounter between sexual scientists constructing sexual case studies along with newly assertive homosexual men supplying self-penned sexual autobiographies. Homosexual autobiographies were intensely interesting to these men of science but lacked the brevity, structure, and discipline of a formal clinical case study.