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In order to be effective, sexually transmitted infection (STI) testing should be comprehensive based on the clients` sexuality and risk practices. Using data from the Sydney Gay Community Periodic Survey, we explored trends in and factors associated with STI testing among gay men during 2003-2007. Among men who were not HIV-positive, 68% were tested for HIV in 2007. HIV testing was more common than STI testing and remained stable during 2003-2007. Use of swabs and urine samples increased significantly (P-trend <0.001 for each). However, until 2007, 33% of men were not tested. Sexual behaviours (higher number of partners, having casual partners and engaging in unprotected anal intercourse with them) were associated with STI testing. HIV-negative men were tested for STI less often than HIV-positive men (prevalence ratio = 0.56; 95% CI: 0.47-0.68). STI testing among HIV-negative men has improved significantly but remains inadequate for STI control and HIV prevention. It should not be assumed that appropriate and comprehensive STI screening is always provided to clients.