Some communities have started needle exchange programs to give free, clean syringes to people so they won't need to share. These programs are controversial because some people think they promote drug use. But research on needle exchange shows that this is not true. For a lot of people, drugs and sex go together. Drug users might trade sex for drugs.
Some people think that sexual activity is more enjoyable when they are using drugs.
Drug use, including alcohol, increases the chance that people will not protect themselves during sexual activity. Someone who is trading sex for drugs might find it difficult to set limits on what they are willing to do. Anyone using drugs is less likely to remember about using protection, or to care about it. It is very important to take every dose of anti-HIV medications. Drug use is linked with poor adherence, which can lead to treatment failure.