Tonight, my partner was performing oral sex on me. As I approached orgasm, I geared up to ejaculate on her chest, but instead I showered her with urine! I was fully erect at this time, and until now I've never been able to urinate with an erection.
Needless to say I'm terrified at what happened. What could have caused this?
If you have to go you have to go. Your bladder isn't going to allow itself to explode just because you're erect. It's a little troubling that you lost control of that but unless you see a recurring problem with bladder control I wouldn't let it worry you.