How does circumcision decrease hiv and aids rate?

Micro Environment: The side of the foreskin that rests against the penis is much more hospitable to the HIV virus. It provides a moist environment, and there are certain types of cells (called langerhans cells) present that HIV readily invades. The foreskin can also form small cracks or fissures during intercourse, allowing for easier transmission of the virus.

Reduces entry area: Hiv can penetrate inner foreskin more easily than other skin so there is less area for the virus to penetrate, especially if there are any tin y rents in he foreskin.

Multiple theories: There are multiple theories surrounding why circumcision decreases hiv/aids. One theory suggests that there is a larger number of langerhans or "hiv target cells" located in the foreskin of uncircumsized men, thus increasing the risk of HIV infection. Another theory suggests that the skin is thinnest in the foreskin, thus facilitating HIV infection. Thus, circumcision would reduce these risks.