Fig. 3.

The associations between time since PrEP initiation and HIV risk-related sexual behaviors within heterosexual HIV serodiscordant couples. Associations measured using individual longitudinal data and linear regression models with fixed effects for individuals, fertility intentions (trying, not trying, pregnant), sex with a non-study partner (study partner outcomes only), treatment for a genital infection, use of hormonal contraception, calendar month, and number of sex acts (any condomless sex outcome only). Associations above the red line would suggest sexual risk compensation—i.e., an increase in HIV risk-related sexual behaviors within serodiscordant relationships following PrEP initiation