In MPAsquared's defense, I would have to say that getting herpes (HSV2) from asymptomatic viral shedding in areas OTHER than the mouth and genitals highly unlikely. In fact getting HSV-2 in the mouth is rare in itself, asymptomatic or not. That being said, its still possible.
Lets assume she has HSV2 (obviously I dont know, or beleive she does or doesn't, one way or the other) AND that she is giving slides during outbreaks or periods of viral shedding. So long as she avoids the mouth, genitals, and any apparent open sores the client should be fine, unless someone up there REALLY hates you.
So, MPAs are definitely less susceptible than a SP, but maybe the same or less than a stripper (if we stay within strict definitions...). That being said, viral shedding is thought to be responsible for up to 70% of transmissions, probably because it is often not perceptible to most people.
On a personal note, I think there is a fair amount of fear-mongering when it comes to STDs, because if people knew the statistics it would tempt the ill-informed or ill-educated to 'play the odds', which happens enough as it is.
As it is, it seems that on this forum most professionals and clients know the risks involved with these activities save for the unfortunate chap who started this thread...