You could look at Humphry’s original thesis which is quite a bit longer than his published version of the same title. Humphry’s Thesis is available via proquest: http://search.proquest.com/pqdt/docview/302366718/6745A15B7BC94E54PQ/6?accountid=15159

You may also find of interest:

Editorial Introduction: Moving Beyond the Controversy: Remembering the Many Contributions of Laud Humphreys to Sociology and the Study of Sexuality, Schacht, Steven P. The International Journal of Sociology and Social Policy; Bingley24.3-5 (2004): 3. http://search.proquest.com/pqdt/docview/203706947/6745A15B7BC94E54PQ/16?accountid=15159

Here is some further background on the sociology department:

Sociology at Washington University in St. Louis: History and Reflections, 1906-1989 David J. Pittman and Deirdre Boden.  The American Sociologist , Vol. 20, No. 4 (Winter, 1989) , pp. 305-321 Published by: Springer Article Stable URL: http://www.jstor.org/stable/27698490

History of Anthropology at Washington University, St. Louis, 1905-2012 David L. Browman http://openscholarship.wustl.edu/books/1

Washington University's Pig Roast: Ending Sociology and Jeopardizing Liberal Arts Barbara Sherman Heyl The American Sociologist , Vol. 20, No. 4 (Winter, 1989) , pp. 341-345 Published by: Springer Article Stable URL: http://www.jstor.org/stable/27698495