Oh, come on. At least half of you have herpes (simplex). Pretty much everyone and their mother has it (I do, and so does my mother!).
This reminds me of an unfortunate story: I had a cold sore at the same time a friend did. I jokingly asked him for "a high five for the herp!"
He got all shocked and angry: "What do you mean?! I don't have herpes!!1"
I pointed out that he had a cold sore. If you've ever had even just one cold sore, you carry the herpes simplex virus (along with like 60% of the adult population in the US. Active cold sore, active virus.
He insisted that no, no, no, it's just a pimple.
A month later, his girlfriend has her first herpes outbreak--genital herpes, waaaaay less fun than oral herpes. He gave transmitted it from his "just a pimple" to her crotch.
So the moral of the story is that it's always a good idea to ignore STDs.