Objective: Risk behaviors for sexually transmitted infections among men wit
h mental disorders who were using outpatient psychiatric services and among
men who had never been treated for a mental disorder were compared, Method
s: Ninety-two men with major mental disorders, including schizophrenia, bip
olar disorder, and mood disorders, were individually matched for age and et
hnicity with 92 men who had never been treated for mental illness. All subj
ects completed a semistructured interview about specific risk behaviors for
sexually transmitted infections that they may have engaged in during the p
receding year Results: The 49 patients with mental disorders who had been s
exually active in the preceeding year were significantly more likely than t
he 78 sexually active comparison subjects to ha ve known their sexual partn
er for less than one day and to report having been pressured into unwanted
sexual intercourse. A strong but not significant trend was found for sexual
ly active patients to have had sex with a male partner and sex with a drug
user Overall, the patients with mental disorders answered ten questions mea
suring AIDS knowledge questions significantly less well than the comparison
subjects. Conclusions: The results underscore the priority for developing
programs for preventing risk behaviors for sexually transmitted infections
among men with mental disorders.