HIV can be prevented in many ways, but they are not always followed.
There a three main ways the HIV can be spread:
1. Sexual intercourse
2. Intravenous drugs
3. Blood transfusions (which are very rare now because all blood is tested)
HIV is spreading like wild fire among adolescents because they don't believe it can happen to them.
A small percentage of people who use condoms still get HIV because:
Misuse of condom
Use of drugs or alcohol which can impair judgment or proper use
Using a defective condom. (Always check first)