The only way to be 100% safe from STIs and HIV/AIDS is to abstain from all sexual activities. If you are going to have sex, the correct and consistent use of latex condoms can help protect you from many STIs, including HIV/AIDS. Latex condoms also help reduce the risk of unplanned pregnancy. You can’t tell if someone is infected just by looking at them. Even if you’re very close your partner may not know they have an STI — or they may be too embarrassed to tell you. It’s up to you to protect yourself.