INTRODUCTION: Daily antiretroviral pre-exposure prophylaxis (PrEP) is a safe and effective method of preventing HIV. Clinicians' assumptions, biases, and judgments may impede access to PrEP. Specifically, concern that patients will engage in more condomless sex ("risk compensation") has been cited by clinicians as a reason for not prescribing PrEP. METHODS: In this experimental study among medical students, we systematically varied race (White or Black) and condom-use behaviors (continued-use, planned-discontinuation, or continued-nonuse) of a fictional patient (all men with multiple male sex partners). Participants indicated the patients' assumed adherence to PrEP, patients' overall HIV risk, and willingness to prescribe PrEP. Participants completed an implicit association test to detect implicit racism and measures of heterosexism and attitudes toward nonmonogamy, which were examined as moderators of patient race and condom-use effects on participants' assumptions and ultimate willingness to prescribe PrEP. RESULTS: Participants ( N = 600) were most willing to prescribe PrEP to the continued-nonuse patient and least willing to prescribe to the planned-discontinuation patient. No differences were identified based on patient race. The continued-nonuse (vs. continued-use) patient was perceived as less likely to adhere to PrEP, which was associated with lower willingness to prescribe. Negative attitudes toward nonmonogamy exacerbated this effect. No effects of implicit racism or explicit heterosexism were identified. CONCLUSIONS: Participants were least willing to prescribe PrEP to patients who planned to discontinue condom use. Patients seeking PrEP are exhibiting agency over their sexual health, and clinicians should fulfill their role in ensuring access to this primary preventative therapy. Training and curricular reform regarding PrEP are needed.