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The need to urinate stimulates the production of a chemical that inhibits blood flow out of the of the penis just like arousal does. That is what "morning wood" is. An erection prevents a guy from peeing (unless he concentrates on letting go) and prevents us from peeing when we don't want to.
Yea. The full bladder causes added pressure on the prostate, resulting in an erection. That's my theory. Lol
ya only in real bad cases like morning wood
It doesn't always happen but I have had it happen. It usually only happens when I have to go really badly, though.
Nope, at least not in my case.