# good morning, errections ... good, morning errections **URL:** \ **Category:** Factual Questions\ **Created:** [January 19, 2006, 11:45am UTC](https://boards.straightdope.com/t/good-morning-errections-good-morning-errections/340644 "2006-01-19T11:45:26Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![Spiff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/spiff/32/9852_2.png) [@Spiff](https://boards.straightdope.com/u/Spiff)\ **Post date:** [January 19, 2006, 7:11pm UTC](https://boards.straightdope.com/t/good-morning-errections-good-morning-errections/340644/21 "2006-01-19T19:11:15Z")
> [@RealityChuck](#): > > Because you can’t urinate and have an erection at the same time. Hollywood says otherwise. I mean, I \*\*SAW \*\*it happen in The 40-Year-Old Virgin, and so it must be true. 😃 But seriously, one cannot \*\*ejaculate \*\*and urinate at the same time (it’s a valve thing …) One \*\*CAN \*\*piss with a hard on, it’s just very messy. :eek: ---
**Author:** ![Cervaise](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cervaise/32/16693_2.png) [@Cervaise](https://boards.straightdope.com/u/Cervaise)\ **Post date:** [January 19, 2006, 7:23pm UTC](https://boards.straightdope.com/t/good-morning-errections-good-morning-errections/340644/22 "2006-01-19T19:23:15Z")
> [@RealityChuck](#): > > When you have to pee real bad during the day, do you get an erection? Sure. Of course, I also get an erection when someone walks past my office door, or when the phone rings, or when I look out the window and see that the weather has changed. Draw your own conclusions. ---
**Author:** ![HMS\_Irruncible](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/hms_irruncible/32/7394_2.png) [@HMS\_Irruncible](https://boards.straightdope.com/u/HMS_Irruncible)\ **Post date:** [January 19, 2006, 7:42pm UTC](https://boards.straightdope.com/t/good-morning-errections-good-morning-errections/340644/23 "2006-01-19T19:42:36Z")
Just a couple of links I found that might be helpful (bolding mine): [Link](http://www.spinalcordcenter.org/manual/pdf-files/scibook-chp17.pdf) > [@](#): > > Reflexogenic erections are coordinated by the spinal cord in the > area of S2, S3 and S4. A reflexogenic erection occurs with direct > stimulation to the penis or **by internal stimulation such as a full > bladder**. Reflex erections need the spinal cord reflex of S2, S3 > and S4 to be intact. [Link 2](http://lifecenter.ric.org/content/2560/?topic=3&subtopic=163) > [@](#): > > There are two areas in the spinal cord that most affect sexual functioning. The first is T11-L2 and the second is S2-S4. Where your injury is in relation to these two areas and the degree of injury will have an effect on your sexual functioning. > > The center at T11-L2 controls psychogenic erections (those stimulated in the brain when you look at a magazine or fantasize) and releasing fluids. The center at S2-4 controls reflexogenic erections (those stimulated by masturbating, rubbing the inside of the thigh, **a full bladder** , and when catheterizing) and ejaculation (the release of semen). When there is no damage to the spinal cord, the messages traveling along the spinal cord and to and from the brain can work together at the same time. But, when injury to the spinal cord occurs, the messages are disrupted. I don’t mean to imply that a full bladder is the only factor, just that there is no reason it can’t be a contributing factor. Why don’t we get erections every time we have a full bladder? Perhaps for most people it is a weak influence that can only manifest in the depth of relaxation that only occurs during sleep. For me it is a strong influence; in fact sometimes I get waking erections in response to a full bladder and nothing else. And no, I haven’t obtained a research grant to study this, but I have lived long enough to be familiar with how my own plumbing operates. [Previous page](https://boards.straightdope.com/t/good-morning-errections-good-morning-errections/340644.md?page=1)