Karl Ulrichs' Sexual Orientation Classification Scheme (1860's)



The Human Male:                
   A. Dioning(1)

   B. Urning(2)
           1. Mannling(3)
           2. Weibling(4)
           3. Zwischen(5)
           4. Virilised(6)

   C. Urano-Dioning(7)


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Notes:

1 – Comparable to the modern term “heterosexual.”  A Dioning that sexually behaves like a
Urning is termed an “Uraniaster.”
2 – Comparable to the modern term “homosexual.”
3 – A manly Urning.
4 – An effeminate Urning.
5 – A somewhat manly and somewhat effeminate Urning.
6 – An Urning that sexually behaves like a Dioning.
7 – Comparable to the modern term “bisexual.”

(for additional information see Ulrichs, K. H. The Riddle of Man-Manly Love, Prometheus Books, Buffalo, NY, 1994.; Carpenter, E. The Intermediate Sex, Allen and Unwin, London, 1908.)