Use condoms and use them correctly. Educate yourself on the risks of certain sexual behaviors, like anal intercourse, which can provide an avenue for HIV into the bloodstream. Be careful not to abuse alcohol or other drugs to the extent that your good judgement is impaired. Wait until you're ready for a special, permanent relationship. Then talk with your lover about AIDS and HIV antibody testing before having sex, and use condoms.
Sex is never an emergency.
Only people who have the virus have these antibodies in their blood. Anyone who has any concern whatever that they might possibly be infected may have their blood tested, with confidence that their privacy will be maintained. A code is assigned to your blood sample, which only you know. In most cases, particularly for an initial test, anonymous testing is advisable. Although confidentiality laws are currently strict, laws can be changed.