<s>[INST] Is it safe for two people living with HIV to engage in unprotected sex exclusively with each other? [/INST] It is best for someone living with HIV to avoid becoming infected with a different strain of the virus. Therefore, the advice given in question 11 should be followed, except for the advice about pre-exposure prophylaxis, which is never used by people living with HIV. Source: UNAIDS. Link: https://www.unaids.org/en/frequently-asked-questions-about-hiv-and-aids. Field: Infectious Disease. Disease: HIV </s>