Information collected from approximately one hundred males with sex disorders was analysed in order to attempt to identify some of the causes of the more important sex dysfunctions in men. Those conditions receiving special attention were erectile dysfunction, premature ejaculation and heterophobia. The information gathered comprised those parameters thought to be relevant from the patients' social, sexual and medical histories. Some thirty independent parameters were recorded including a limited psychometric assessment. Information on social class, education, family structure, parent-child relationships, traumatic experiences were quantified as far as possible and to this were added data from the patients sexual history; masturbation patterns, the frequency, pattern and variety of sexual outlet, the nature of his fantasies and so on. Information was also collected on somatotype, relevant medical indices, and smoking and alcohol consumption.