# Morning erections and full bladders -- Correlation? Causation?

**URL:** <https://boards.straightdope.com/t/morning-erections-and-full-bladders-correlation-causation/372429>\
**Category:** Factual Questions\
**Created:** [September 12, 2006, 4:16pm UTC](https://boards.straightdope.com/t/morning-erections-and-full-bladders-correlation-causation/372429 "2006-09-12T16:16:24Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Martiju](https://avatars.discourse-cdn.com/v4/letter/m/e8c25b/32.png) [@Martiju](https://boards.straightdope.com/u/Martiju)\
**Post date:** [September 13, 2006, 1:41pm UTC](https://boards.straightdope.com/t/morning-erections-and-full-bladders-correlation-causation/372429/21 "2006-09-13T13:41:48Z")

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I find that when I constrict the muscles around my bladder to restrict the urge to pee, that has the effect of pushing blood into the penis (yes, I’m doing it now - picture the scene!). My WAG is therefore that as the need to pee increases, muscles constrict and the by-product is an erection. That’s why it doesn’t always happen.

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