Condomless sex is a key driver of sexually transmitted diseases. In this study, we assess the long-term changes (2000–2013) of the occurrence of condomless sex among human immunodeficiency virus (HIV)-infected individuals enrolled in the Swiss HIV Cohort study. The frequencies with which HIV-infected individuals reported condomless sex were either stable or only weakly increasing for 2000–2008. For 2008–2013, these rates increased significantly for stable relationships among heterosexuals and men who have sex with men (MSM) and for occasional relationships among MSM. Our results highlight the increasing public health challenge posed by condomless sex and show that condomless sex has been increasing even in the most recent years.
Below: Frequency with which human immunodeficiency virus-infected individuals report unprotected sex over time (yearly average and 95% confidence interval). Dashed lines correspond to the fit of the piece-wise linear model to the frequencies of unprotected sex. Occasional and Stable refer to type of sexual partnership). The vertical dashed line indicates the level of condomless sex in 2008 (year of the Swiss Statement): 10.8% (men who have sex with men [MSM], stable), 6.0% (MSM, occasional), 15.9% (heterosexuals [HET], stable), and 1.0% (HET, occasional). The table displays the number of questionnaires evaluated for a given year and the number of patients responding to questionnaires in that year.
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