Ok um, I just need at least one of these answered more would be great but as long as one of them is answered I'm fine. 1. how can blood pressure cause erectile dysfunction?
2. what are the risk factors for hiv?
3. how can HIV transmission be prevented?

The human immunodeficiency viruses are two species of Lentivirus that infect humans. Over time, they cause acquired immunodeficiency syndrome, a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.

Explanation:

Hiv transmissons can be prevented with pills or by just the use of a condom.