Answer: Testing is encouraged because treatment for HIV is highly effective and early diagnosis can improve your chances of living longer and being healthier. Furthermore, knowing your HIV status can greatly reduce your risk of passing HIV to others if you take precautions.
Or
Well logically, a sexually active person would want to catch any STD as soon as possible, in order to begin treatment and to avoid spreading the disease. three months is often enough to catch it without it being so often that someone would be inconvenienced by it.
The CDC suggests retesting because of the "window period." This is the length of time between exposure to HIV and when HIV shows up on a test. This can take up to three months. So if your test result is negative, protect yourself and get retested after three months.
