People don't talk about it much because it has such a huge emotional impact, but herpes simplex virus (HSV) is also a huge health problem throughout the world. As many as 1 in every 5 people has potentially been exposed to HSV, and their immune response to that exposure can be determined with a blood test. But unfortunately, that immune response in the form of antibodies does not "cure" the virus. The viral particles live on in the nerve roots and continue to reassert themselves in the form of blisters on the genital skin or cold sores on the lips or mouth off an on throughout that persons lifetime. Genital herpes, generally caused by HSV type 2 (type 1 causes most fever blisters/cold sores), is clearly more stigmatized, and plenty of people who have this problem don't even realize what it is. Thus, the cycle of spreading the virus via intimate contact goes on.
How can the cycle be broken? Since protective barriers such as condoms fail to cover enough skin to do the job, and since many people shed viral particles from their skin even with no visible sores present, the clear choice of how to avoid the problem of HSV exposure would be a vaccination. Vaccine development has been ongoing and is currently being evaluated as to actual effectiveness in disease prevention. It appears that the vaccine has more potential effectiveness in women than in men, and the immunity it affords women seems to be incomplete...so we're not there yet.
Those who already suffer with HSV outbreaks would not benefit from a vaccine in any case. They are left with managing their outbreaks by various measures including decreasing their stress levels and taking a daily dose of a suppressing prescription anti-viral medication. There are several good choices on the market that have been used for years with success, but clearly, it would be better not to have to deal with this problem at all.