A good article about HSV 1 and HSV 2 .
Takeaway quote:
Acquisition of one type is more difficult-though certainly possible-if you already have the other type. This is because either type, contracted orally or genitally, causes the body to produce antibodies, some of which are active against both HSV-1 and 2. This acquired immune response gives some limited protection if the body encounters a second type. When a person with a prior HSV infection does contract the second type, the first episode tends to be less severe than when no prior antibodies are present.
On a practical level, this means oral HSV-1 is often the most easily acquired herpes infection. Usually the first herpes simplex virus that people encounter, oral HSV-1, is typically spread simply by the kind of social kiss that a relative gives a child. Because children have no prior infection with any HSV type, they have no immune defense against the virus.
By the time they're teenagers or young adults, about 50% of Americans have HSV-1 antibodies in their blood. By the time they are over age 50, some 80-90% of Americans have HSV-1 antibodies.
By comparison, almost all HSV-2 is encountered after childhood, when people become sexually active. Those who have a prior infection with HSV-1 have an acquired immune response that lowers - though certainly doesn't eliminate-the risk of acquiring HSV-2. According to one study (Mertz, Annals of Internal Medicine,1992), previous oral HSV-1 infection reduces the acquisition of subsequent HSV-2 infection by 40%.
Let me emphasize this. By the time you’re a teenager, the odds are 50/50 that you’ve already been exposed.
By the time you're fifty, there's only a 10 to 20 % chance that you have not been exposed. So if you’re 18, there is a 1 in 2 chance that you have already been exposed to HSV 1. And if you haven’t been yet, the odds are overwhelming that you will be exposed at some point in your life. But being exposed to HSV 1 lowers the risk (somewhat) of contracting an HSV 2 infection.
Another quote:
While HSV can be a frustrating and painful condition for some people, in general the virus is less a medical problem than a social problem. For most of us, genital herpes is no more dangerous than a cold sore.
Personally, I think it would be downright silly to reject someone because they suffer from cold sores. It’s easily treatable and manageable, and over time recurrence and severity of outbreaks diminishes (if there is ever an outbreak to begin with.)
HSV 1 is fucking ubiquitous. The good news is that it's no big deal!