I think this may be a place where anti-discrimination and OSHA bump up against each other. If producers can't turn down HIV-infected actors, then aren't they endangering their HIV-negative actors?
To answer your question, the risk of a condom breaking is much higher than a surgeon getting bodily fluids into a patient. Sexual intercourse necessarily involves production of bodily fluids with nothing but the condom to contain them. A surgeon is not required to produce highly infectious fluids as part of performing an operation. If a latex glove breaks during an operation what are the chances that some HIV-infected fluids will leak out and into the patient? What are the chances that an actor/actress will be infected when a condom full of HIV-positive semen breaks inside of them?
To answer your question, the risk of a condom breaking is much higher than a surgeon getting bodily fluids into a patient. Sexual intercourse necessarily involves production of bodily fluids with nothing but the condom to contain them. A surgeon is not required to produce highly infectious fluids as part of performing an operation. If a latex glove breaks during an operation what are the chances that some HIV-infected fluids will leak out and into the patient? What are the chances that an actor/actress will be infected when a condom full of HIV-positive semen breaks inside of them?