From what I read in an article years ago, if they've been in the business for awhile, they've got herpes. (Not space herpes, the Earth kind.)
Well, according to Valtrex commercials, 1/3 of all people have herpes WITHOUT being in porn.
I've always been skeptical of that statistic.
Well first of all, there are different types of herpes. I think it's like something over 50% of people have oral herpes. The kind you're talking about, I wouldn't be surprised if the rate is at least 20% or higher. It's not always accompanied by symptoms so often people are infected and pass it on without even realizing it. Things like condoms reduce your risk but don't necessarily eliminate it, and once someone is infected they have it for life, essentially.
That's what I understand, anyway. I could be wrong!