To carry this comparison one step farther:
This is true of the other parts of the male and female reproductive organs.
I think this is the only questionable part of your post. An amusing theory, though.
I’m pretty sure you can. You can’t ejaculate and pee at the same time, but I’m pretty sure I’ve peed with a boner before.
Well, I know I have. Woohoo, I’m special!
Its possible, but difficult. And you have to get part-way relaxed first. Rather annoying sometimes.
Yup, you can pee with a boner, and pardon the pun but it is hard.
I think the reason for early morning woodies is your bladder is full and pressing against your prostate. Voila, boner.
. . . So we don’t know whether we’re coming or going?
Wow…you mean someone’s actually tried to do this? Fascinating.
Snicks
…and I see after posting, not just one, but several people have. Apparently this is quite common. Still fascinating.
Waiting for the guy to check in who’s tried it while ejaculating - our enquiring minds need to know! Alas, I cannot try it myself; I lack the proper equipment.
Snicks
Urine does not contain bacteria unless you have a bladder infection. Women do tend to get bladder infections more often if they are sexually active because of the close proximity of the anus to the vagina and urethra. Mix it up a bit and BAM you’ve got a bladder infection.
I don’t know about you but I was never a FISH!
If if had phrased my question better (I should have used the term Natural Selection somewhere), this is along the lines of the answer I was looking for.
As for peeing with an erection, I don’t have a problem with it at all. However, I haven’t experienced this in a few of years. Now that I think about it, I believe that ,um, “boner urine”:D, was always a result of too much alcohol in my system. This usually occured after a night of bar-hopping. Has anyone else experienced this? Every instance I can think of took place at some strange woman’s house. I think the female equivalent would be the extreme weight gain that these women would go through over the course of the night. I stopped drink a few years ago, and since have never experienced either of the phenomena since.
But women don’t get boners, and most of us don’t pee the bed. I know personally, when I have to go I just wake up.
I’m thinkin’ there may be some flawed logic here. 
As I recall (sorry that I don’t have my mammalian embryology texts available, and it has been many years since I took the courses at university), the root cause of the relative coexistence of the excretory and reproductive systems is as follows:
The gonads (ovaries and testes are both termed gonads by biology types) actually develop from kidney-like structures which have the same sort of macro anatomy as the testes…and have the same sort of tubing attached. However, in mammals, these become gonads, and there is a second and very similar set of organs that go on to develop into kidneys and the tubes that are associated with them.
Therefore, the two systems are located in the same area, have similar gross anatomy, and at least in the male, share part of the tubing.
Wow…it has been a long time. I hope I have the general concept correect.
Every morning from age 8 or 9 until at least 19 or 20. A lot of mornings to this day.
Are you male and you’ve never had to do this?
I can pee out of an erection, too. Talk about your golden arches. But anyway . . .
I’ve heard that the nightly erections experienced by most men are due to the body periodically sending more blood to the genital region to ensure that all the penile tissue is properly oxygenated. Guys who wake up during this periodic tumescense experience “morning wood.” I have no idea if nightly erections are really necessary for penile health and would appreciate any information or informed speculation that can be offered by any Doper who may read this. Hopefully this isn’t too much of a hijack since the phenomena has already been mentioned in this thread.
On a less serious note . . .
I’ve never excreted waste from my hand . . .
IANAD but I’ve seen a lot of programs on Erectile Dysfunction (no reason other than I cant reach the remote to change channel) The erectile function is normally in the ON position. When you are completely relaxed (as in asleep)the muscle that normally prevents the blood from engorging the penis also relaxes and viola! hello woody!
one of the ways prior to viagra was to inject a muscle relaxant directly into the penis! Thats when I quickly got up and manually changed channels… :eek:
I’d like to be the first to coin a new word:
[clears throat]
SEXCREMENT!
As a violist, I am offended. Or possibly flattered.