This paper provides a profile of clients seen by male sex workers (MSWs) in Córdoba, Argentina. Thirty-two MSWs completed a diary after each paid sexual encounter with a client over a two-week period. The results show that 254 commercial sex encounters were reported. More than half of these encounters were with first time clients. The most common source of recruiting clients was advertisements followed by street contact. The majority of the clients were aged in their 30s or 20s, and identified as 'middle class' and 'bisexual' or 'gay'. In the majority of the encounters, alcohol or drugs were not used by clients, and in about less than half of the cases, the MSWs had some personal tracing information about the client. Most of the clients indicated to the MSW what sexual activity they wanted and unsafe anal sex was requested in a minority (6%) of the encounters. While most workers reported having no or little attraction to the client, most indicated that they would serve the client again. The implications of the results for public health education and further research are discussed.