No changes occur: Blood vessels in the penis carry blood to and from the penis, in the same manner, regardless of whether it is before urination, during urination, or after urination. During erections, there is less blood leaving the penis, so the penis gets pressurized and firm.
Answered 6/14/2014
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2 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
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