Summary The objective was to comprehensively assess the prevalence of condom-use errors and problems among male clients attending a public sexually transmitted disease (STD) clinic. Men ( n = 278) attending an STD clinic completed an anonymous questionnaire. Seven errors and six problems were assessed. Summative scores were tested for associations with three key variables. Of 834 condom-protected events: 19% were associated with ‘fit and feel’ problems, 15% involved breakage, 14% involved lost erection, 9% were associated with lost erection while applying condoms, 8% involved slippage during withdrawal and 7% involved slippage during sex. A mean of 6.4 errors/problems were observed. None of these summative variables (total errors, total problems or total of errors and problems) were significantly associated with age, minority status or whether men indicated they had ever been taught how to use condoms. Multiple types of condom-use errors and problems may be highly prevalent among high-risk men attending public STD clinics.