Final answer:
The nurse is implementing primary prevention by providing information about safe-sex practices.
Step-by-step explanation:
The level of prevention being implemented in the scenario described is primary prevention.
Primary prevention focuses on preventing the occurrence of a disease or health issue by promoting behaviors and practices that reduce the risk of its development. In this case, the nurse is providing information about safe-sex practices to prevent the transmission of sexually transmitted infections (STIs), including HIV.
Examples of primary prevention in safe-sex education include promoting abstinence, condom use, and regular testing for STIs.