There's some guy over at the Literotica forums who says he's been regularly sucking dick at glory holes for well over 20 years, all in the northeast. He goes on about how much he loves to do it . . . pretty much like some of us here
Hundreds and hundreds of dicks in all shapes, sizes and colors, and has never once caught anything. I tend to believe him; my own experience is that I've swallowed loads from many dozens of cocks from a variety of demographics, and have come out clean on the other side as well. I may be sort of zeroing in on mature married guys who are fairly motivated for some relief, and they're probably a safer risk.
My wife and I also do some threesome and foursome swinging. We got tested a while back and both of us were completely bug free.