Objectives: Prior studies of erectile dysfunction (ED) tend to narrowly focus on relationships with specific comorbidities, rather than evaluating a more comprehensive array of risk factors and assessing naturalistic patterns among them. This study identifies natural clusters of male characteristics from a general population sample per country, quantifies ED dynamics in these profiles and compares profiles across the US, Italy, Brazil and China samples. Methods: National Health and Wellness Survey 2015 and 2016 patient-reported data on men aged 40-70 years (USA n = 15,652; Italy n = 2,521; Brazil n = 2,822; China n = 5,553) were analysed. Hierarchical agglomerative clustering identified clusters where predictors included demographics, health characteristics/behaviours, ED risk factors and provider visits in the past 6 months. Multinomial logistic regression assessed the independent utility of variables in predicting cluster membership, compared with the healthiest control cluster per country.Results: Different natural clusters were found across countries, with four clusters for the USA, Italy and China and three clusters for Brazil. Age, income, employment, health behaviours and ED risk factors predicted different cluster membership across countries. In the USA, Italy and Brazil, younger clusters were predicted by ED, unhealthy behaviours and ED risk factors. Unique cluster profiles were identified in China, with ED and ED risk factors (aside from hypertension) not predicting cluster membership, while socio-demographics and health behaviours were strongly predictive.Conclusions: Natural cluster profiles revealed notable ED rates among adult males of age 40-70 in four different countries. Clusters were mainly predicted by unhealthy behaviours, ED risk factors and ED, regardless of level or presence of positive health characteristics and behaviours. This analysis identified meaningful subgroups of men with heightened ED risk factors, which can help healthcare providers to better recognise specific populations with the greatest need for intervention.Erectile dysfunction (ED) is characterised by the partial or total inability to consistently achieve and/or maintain an erection sufficient for satisfactory sexual intercourse. 1,2 ED can arise from organic (eg neurological damage, hormonal and vascular pathologies, medication side effects, systemic diseases) or psychogenic (eg poor mental health, performance anxiety, relationship problems) sources.However, it is typically because of a combination of these factors and remains a common disorder affecting men over 40 years old. 3,4 ED has a high global prevalence rate of 41% among men over the age of 18 years¸ and the Massachusetts Male Aging Study, the first large community-based observational survey, estimated ED prevalence to be even higher, 52%, in men aged 40-70 years. 5,6 ED prevalence also varies across countries, ranging from 17% in Italy to 34% in Japan, but the common finding central to all studies on ED prevalence is that ED increases with age, despite differenc...