This really is my greatest fear. And sadly, it's not an irrational one.
I have already had an STD in my throat....it's how I learned about the infidelity. (Took me a while to put two and two together, since Mr. Trac-Fone did not choose to share that I'd been exposed to filthy hooker germs, and allowed me to remain ill for a year until it showed up elsewhere, was identified---they don't culture throats for this organism--and was appropriately treated. God knows what else I was exposed to, though.)