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I wondered that too.
Quick search produced this poss reason: (NakedScience site)"When the body is cold ( and it often was when I was swiming) the blood vessels near the skin contract to keep the warm blood away from the skin. This saves losing heat to the water. However it also raises the blood pressure in the body. The body senses this and does something about it- it causes the excretion of some water to drop the blood volume."
nankatsu
Why do you get a full bladder after an hour of swimming?
How does the water your body absorbs get to your kidneys?
Science is amazing.