I have a friend who worked in Adult films...oh boy thats why she's easin her way Out! Too many potential hazards. Most cast mates are Hustled from location to the next project. Some even wonder if the test are fool proof? Yes testing  and monitoring adult players reduces Risk of ruining an anothers life. Most people who enjoy the visual aspects of Porn..are seldom aroused by "The Condom" in Gay and Straight porn. Well at least there are treatments for those affected by this crisis..............