I don't think they can test for herpes unless you have lesions.
Cool story bro: my second year of grad school I TAd human sexuality which, at UW, is this amazing psychology class that basically runs the whole gambit. On fridays we'd have guest speakers who were well known in the kink community come and talk about what they were into--im talking bloodplay, hardcore D/s stuff, like simulated snuff, and bondage like you wouldnt believe. Great class.... Anyway, so I'd never taken this class before and this was my first time TAing it, and up comes the STI section and HOLY SHIT. I saw my fair share of bumpy vagina and pus filled dick pictures in high scool health class, but this shit was fucking traumatising. For the next year, every time my balls itched I was convinced I was going to grow a cauliflower out of my cock.