If both you and your partner have completed the window period after your last potential high-risk exposure (including unprotected sex, sharing needles, unsafe blood transfusions, etc.), and both test results are negative, then neither of you is infected. Sexual activity between you is safe.

However, even when both partners test negative for HIV, condom use is still recommended.

Condoms not only prevent HIV transmission but also reduce the spread of other sexually transmitted diseases, such as syphilis, gonorrhea, and genital warts.