Morning wood and full bladder.
Originally posted by ICM
Isn´t it unhealthy to try and do both in quick succession? I´m thinking that because the body´s natural defense against you pissing yourself in the morning is to get an erection isn´t it? The two functions can´t coexist (actually they can, but are not meant to) and so surely trying to urinate right after sex is stressing things?
Some sources say a morning “piss hardon” is caused by the full bladder pressing against the nerve centers responsible for erection, but that’s probably not true. Most authorities say that morning wood is due to a combination of REM sleep cycles (rapid eye movement sleep is when we dream) and a man’s tendency to produce more testosterone in the morning. The full bladder just happens at the same time and isn’t really responsible for the erection (you can have a full bladder during the day and not get hard, and you can have a morning erection without a full bladder).
The muscles around the bladder “neck” (where the bladder exit becomes the urethra) do contract during ejaculation in order to prevent semen from entering the bladder. This urethral closure can be overcome during ejaculation and semen can enter the bladder (“retrograde ejaculation”) if enough pressure is applied to the urethra “downstream”. This practice is not recommended. The bladder neck muscles remain slightly contracted for a few minutes after ejaculation, but you can force the urine out without damaging anything. The closure of the urethra is an ejaculation thing and is not related to erection and is not intended to keep you from urinating in your sleep.
We are working on a couple of articles about penile anatomy, erection and ejaculation and in the next few weeks (if we get it done) we’ll have something posted in the Men’s Sexual Health forum that will hopefully explain a lot of this.