Why do you have to pee right after you poop?

This is actually a serious question. About 10-15 min after a #2, I usually require a good #1. Is there a legitimate biological reason why?
Update: This is an actual question. Yes, most people (myself included) pee at the same time as poop, but I have noticed that about 15 min after a good #2, I have a lot of #1 to take care of. If anyone can provide a link to an article explaining why, Best Answer is yours.
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