Cross-sectional study of sexual behaviour and health of gay and bisexual men in suburban Sydney, New South Wales, Australia: contrasts between sex venue and clinic attendees.

Background In Australia, men-who-have-sex-with-men (MSM) have higher rates of sexually transmissible infections (STIs) and HIV compared with heterosexual men. We compared demographics, behaviour and HIV/STI prevalence for MSM attending a sex-on-premises-venue (SOPV) or the local sexual health clinic (SHC) to determine key differences. METHODS: Men attending a SOPV during onsite HIV/STI screening from November 2015 for 12 months were compared with MSM attending a local SHC for screening. Each group completed a self-administered questionnaire and STI/HIV testing. Data analysis was performed using SPSS. RESULTS: Compared with SHC participants (n = 108), SOPV participants (n = 84) had a higher median age (47 years [range, 22-88] vs 33 years [range, 19-71]; P < 0.001) and less likely to report previous HIV testing (73% vs 89%; P < 0.01), STI testing (60% vs 90%; P < 0.001) or be vaccinated for hepatitis A (32% vs 65%; P < 0.001) or hepatitis B (35% vs 73%; P < 0.001). SOPV participants were more likely to be married, widowed or have a long-term female partner (39% vs 7%; P < 0.001) and have a higher prevalence of urethral and rectal chlamydia (7% vs 1%; P = 0.02 and 8% vs 2%; P = 0.03, respectively). There was no significant difference between the groups for detection of syphilis (4% vs 9%), gonorrhoea (5% vs 9%) or HIV (1% vs 0%). CONCLUSION: MSM attending the SOPV had higher anogenital chlamydial prevalence compared with those attending the SHC. They reported higher rates of sex with female partners, which may facilitate STI/HIV transmission to heterosexual populations. Our findings have implications for HIV/STI service provision, contact tracing and local health promotion initiatives.