How to lower the risk of STIs and look after your sexual health. The chapter starts with safe sex practices, including condoms, which protect against most STIs as well as unwanted pregnancy. It explains that vaccines are available for two viral STIs, hepatitis B and HPV, and why regular testing matters when so many infections show no symptoms. Readers learn about medicines used for prevention and management, such as pre-exposure prophylaxis (PrEP) for HIV, and how infections can spread through shared needles, sex toys or towels. The chapter ends with the value of honest conversations with partners about sexual history and testing.