a female friend's ex had herpes. he was on valtrex.
they had sex for 2 years on the pill,
she never got herpes, no condom.
I hear it is safe as long as you don't have sex during outbreaks and are sufficient on the pill.
Also, the gyno told my gf the same thing. As long you are on the pill, it's safe. (TribalWar v. Trained Medicial Doctor. hmm)
Infact, if we both have it, we only need to take it for a year and it will won't have to take it again, if we do decide to split, we will have to take it everyday.