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 The terminology proposed by Ziehen ( "Zur Lehre von den psychopathischen Konstitutionen," _Charité Annalen_, vol. xxxxiii, 1909) is as follows: For absence of sexual feeling, _anhedonia_; for diminution of the same, _hyphedonia_; for excess of sexual feeling, _hyperhedonia_; for qualitative sexual perversions, _parhedonia_.
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