Categorical and multi-axial diagnosis of male erectile disorder.

Diagnostic information was examined on 258 men with male erectile disorder in a multi-site study. Of the sample, 78% was diagnosed as having difficulty both in obtaining and maintaining erections; 20% had a secondary or tertiary diagnosis of hypoactive sexual desire disorder. There was minimal evidence that the multi-axial diagnostic system has advantages over the categorical DSM-III-R diagnosis of male erectile disorder.