Case histories of 330 psychotic servicemen admitted to the Neuro-psychiatric Service of an Army General Hospital were reviewed for incidences of dating and reported heterosexual intercourse. The prognostic significance of pre-psychotic sexual experience was determined by comparison with response to somatic type treatment and discharge disposition. Statistical analysis (differences between means and proportions) seemed to indicate for this group of patients that the greater the degree of social interaction (as measured by normal sexual behavior) prior to psychosis the more favorable the prognosis i.e., fewer treatments needed and more favorable disposition. The prognostic value of reported pre-psychotic sexual experience and the need to measure such objectively are discussed.