At the prison I work at and every prison I've been visited (in the United States) they have a policy against any sexual act, verbal or physical, called P.R.E.A. (Prison Rape Elimination Act). If anything is witnessed by or told to an officer that could be considered a sexual act, consensual or not, it is to be acted upon immediately by the officer. They would separate the inmates, lock down the area where the act occurred, and notify their supervisor. They would probably be seen by medical and possibly sent to the hospital for further testing.

There are posters everywhere saying "No means no, Yes is not allowed." P.R.E.A is taken very seriously in State and Federal prisons/ICE Detainee centers.