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He is the author and ( co -) editor of more than 60 sexological publications, including eight books ( two in English: Sexology Today.
A Brief Introduction.
Düsseldorf 1993, 141 pp. ; Bisexualities.
The Ideology and Practice of Sexual Contact with Both Men and Women.
New York 1998, 270 pp., both with E. J. Haeberle ) and two book series.

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