More states are criminalizing sex by individuals who know they are positive. Indeed, there are already cases heading through the courts, in which men who were raped and infected in prison are demanding accountability from the penal system. These cases haven't gotten much publicity, because the media mostly think it's too nasty to talk about. They will find plenty of data if they look. There are a number of important points.
Statistics are hard to come by.
Most inmates and former inmates who have been raped in prison, or coerced into prison sex through threats of violence, are reluctant to talk about it. They are involved with inmates who are suing state authorities alleging that the state was responsible for their being infected with HIV because prison authorities failed to investigate their complaints of sexual attacks. You can also contact the National Corrections Commission. Recently they did admit to a prison HIV infection rate that is five times higher than the national average. These figures represent what they happen to know about 1.2 million men and boys in prison, and a growing number of women.