NGU is non-gonococcal urethritis. It is an inflammation of the urethra from "something" foreign than has passed back up the urethra. I found that I am susceptible to this from condoms that come with spemicide in the receptacle tip. It's not an STD, just a reaction to something that passes back up the urethra.
I experienced it this past winter with an SP who had spermicidal condoms. The symptoms are STD-like - feels like you're pissing razor blades. I got checked out and was diagnosed with it - again, not an STD. It went away in about 10 days but BOY!! Urinating was a new experience in pain for those 10 days.
Anyone else ever experience this?