Well, you can't get re-infected if you've already been infected with a certain simplex of herpes, because you never become UN-infected. Herpes sticks around in your body forever. That's why people get shingles--the chicken pox virus (yes, that's herpes too) stays in your blood and when your immune system is weakened or if you're just really unlucky it'll come back in the form of shingles. Anyway, once you are infected with either simplex 1 or 2 it can come back at any point during your life. Most of us already have herpes simplex one. A lot of people got it when they were kids. Simplex one isn't as much of a strict STD as you might think it is. I guarantee you that a large portion of you reading this have herpes simplex one and haven't even really thought about it or realized it. And yeah, it'll always be there, but odds are you're not going to be broken out a lot. If you happen to have a cold sore breakout you're supposed to shy away from oral sex, but that's about all a doctor will tell you about that one. Most people won't have issues with simplex one because it's a relatively harmless disease.
That's about the gist of what the doctors told me. But one last thing: people spout more bullshit about herpes thinking they're telling the truth than almost any other disease. You would not BELIEVE the things I've heard (and checked against the doctors to be sure) spoken with utter faith by people I know. So I guess I'm saying be careful where you get your information (that warning includes listening to me--i could be mistaken about some of this information). Take truth from doctors only.