Originally Posted by Cap'nCrunch
It's possible that the soap isn't the problem at all. If you have a urinary tract infection, it'll burn when you pee. See, I would think it'd be kinda difficult to get soap INTO the urethra, but... Last thing -- are you sexually active? If you are, there's a chance you have gonorrhea, but I'd guess you don't. You'd know.
Gonorrhea usually has other weird symptoms such as green or yellowish discharge from the urethra.
The soap suds and bubbles can line the urethra and fall in with water force or gravity, or just get caught while it's open just enough.
I usually don't think anything is a infection, but that might be a case. If you're worried you might have one, go see your doctor.