Conducting research on HIV/AIDS related topics in developing countries in particular, is not easy. Most of the people who are at risk of infection are hidden and hard-to-reach for a number of reasons such as physical, behavioral, and cultural barriers. Apparently, the incidence of HIV infection in Iran cannot be estimated with current epidemiological methodologies and a new approach should be considered. Modeling is one of the ways to solve the problems appearing in the real world. Modeling makes it possible to measure the current status indirectly, and provide predictions for the most...