An HSV (1/2) vaccine is really important, in that the virus can increase chances for HIV transmission during it's viral shedding phase. Even if HSV is well-controlled by drugs like Acyclovir, lowering the overall risk of HIV transmission would be huge. In addition, HSV, along with HPV is one of those STDs that isn't 100% avoidable even with condom usage, sometimes infecting people who are surprised given that they had always practised 'safe sex' at least by consistently using condoms.