Do people with a penis have a higher exit velocity of their pee compared to those without because of its barrel-like shape?

10 days ago by Fleur_ to c/showerthoughts

This is a toilet thought, please ban me mods.

AbouBenAdhem 66 points 10 days ago

The velocity is proportional to bladder pressure and inversely proportional to the square of the diameter of the urethra. The shape of the body parts outside the urethra is irrelevant.

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Fleur_ 11 points 10 days ago

This isn't true because I can squeeze the tip of my foreskin and the pee will start spraying everywhere super fast. Similar to covering the end of a hose with my thumb.

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LurkingLuddite 31 points 10 days ago

Similar to the hose, your feeble attempts at restriction only make the stream stronger.

There is a fundamental pressure being restricted. IF she has a bigger urethra than you, she'll wreck you. If she has a narrow urethra, she might be in the same support group as Hank Hill.

Either way, the fundamental limit of how much pee can flow will always follow a basic function.

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can_you_change_your_username 15 points 10 days ago

I used to think that women had larger urethras than men because female catheters are larger. A post similar to this one caused me to do a bit of reading though. Women's urethras are actually a little smaller on average. They can use larger stiffer catheters because their urethras are much shorter and almost straight. Men's catheters have to be narrower because they have to be flexible to go through men's longer curvier urethras.

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Fleur_ -18 points 10 days ago

I don't even think you know what you're talking about let alone what I'm talking about.

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Dookieman12 16 points 10 days ago

Shitposts =/= shower thoughts

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AbouBenAdhem 13 points 10 days ago

Because of the inverse relationship between velocity and diameter.

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Fleur_ -4 points 10 days ago

Damn crazy. Do you think the shape of someone's genitalia has an effect on that velocity and diameter?

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tankfox 8 points 10 days ago

The optimal genitalia for urination has zero length. Imagine a frictionless laminar flow from a razor edged hole in your torso!

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remon 6 points 10 days ago

Yes, partially covering the opening will increase flow speed, but it doesn't matter how long the hose was before you covered it, so no penis is required to achieve that.

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Fleur_ 1 point 10 days ago

True, so dick length doesn't matter but shape/girth does

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tankfox 5 points 10 days ago

You should try a twist tie, wrench it shut like it's bread you want to actually keep fresh instead of just twisting it up and tucking it under the loaf like most men do. See what happens!

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Fleur_ 4 points 10 days ago

I tried all of these but I just came in my pants? Is that normal?

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tankfox 3 points 10 days ago

You might need a few stitches bruh

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EightBitBlood 32 points 9 days ago

Not a urologist, but I've got a bladder issue that has given me insight on this topic that I've discussed with several urologists.

In short: yes, penis havers piss slightly faster than non-penis havers. But only on average.

All sexes have a urethra, the tube in which pee comes out of, penises just contain a few extra centimeters of urethra on average, compared to non-penis havers.

These extra centimeters, on average, allow the piss to naturally "cycle" around the urethra a bit more, leading to a naturally higher velocity on exit.

To answer your question, there is a device that measures the flow rate of a stream of urine. This device is placed into a toilet, looks like a portable fan, and is pee'd on to determine the strength and speed of your flow over time.

It's used by urologists to determine if you're peeing good or bad, but 100% generates accurate information on the velocity / speed of your piss.

Not intentionally, but I did very well on one of these tests, literally pissing "off the charts" which lead to several conversations with my urologist on who the best pissers out there are. (Horses, Swimmers, Etc). Eventually confirming that men do (on average) pee faster.

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zalgotext 7 points 9 days ago

So what you're saying is that penis-havers have a rifled urethra, which contributes to higher muzzle velocity and accuracy, as well as the spiral shape of the stream?

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EightBitBlood 4 points 9 days ago

Technically, yes, haha

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partofthevoice 7 points 9 days ago

Sounds like way more than a few centimeters. ✋

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bhamlin 2 points 9 days ago

He has dozens of them! Dozens!!!

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davidagain 4 points 9 days ago

Two dozen centimetres is nearly 9.5 inches.

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phoenixz -11 points 9 days ago

Non penis havers

Can we PLEASE just start calling it men and wonen again? Yes, we all know what people mean, no, it's not meant to exclude, yes, trans men with a penis can for this just be considered men (wouldn't they want that anyway?), its all fine, and yes, this is really REALLY over complicating simple things.

It feels like people are walking on egg shells with words because dear god what if you accidentally misgender someone or use a word that makes 2 people in the world feel excluded? Peepee? Men. No peepee? Women. Simple.

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EightBitBlood 15 points 9 days ago

Said it this way because I thought it was funny based on the way OP phrased the question as if penises were some kind of gun attachment. Not because of egg shells. It is just a joke. Should be fairly obvious now that I've pointed it out. And bonus: it's very inclusive and specific.

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fruitycoder 13 points 9 days ago

Honestly penis haver gave me zero friction, what's the issue exactly?

Like it just covers all cases and is explicitly about the subject at hand. Men and women is vague, full of exceptions.

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bhamlin 6 points 9 days ago

I prefer "possible boner owner" anyway.

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Uli 5 points 9 days ago

Plus, it's more inclusive of people like me, who have several penises, the start of a collection.

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vaionko 1 point 9 days ago

So, how speedy is your pee?

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Newsteinleo 3 points 9 days ago

My thoughts exactly, what about men that had to have their penis removed. Penis cancer is rare but a thing.

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meathorse 1 point 9 days ago

So are penis-biting ponies...

Grrr Scott Tenorman!! Shakes fist

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dragonlover 1 point 7 days ago

Please get some real problems to care about. Couple questions:

  1. How does this phrasing affect you in any way?
  2. How is you bitching about this less eggshell walking than other people bitching about non gendered language? Now people have to take your preferences into consideration. Or you could grow up, read the perfectly legible sentence, and move on.
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tiny_hedgehog 23 points 10 days ago

Mine is rifled.

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Fleur_ 10 points 10 days ago

Unlike you heretic, my back shots are smoothbore. Guided by God.

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mufkin 21 points 10 days ago

I’m going to just say this. I hear my wife pee sometimes and it sounds like a water faucet. She has me beat at least.

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Nomad 6 points 9 days ago

Same here. she also finishes way faster, so assuming equally sized bladders it would follow that her flow is much stronger.

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oppy1984 1 point 9 days ago

Yep, my now ex-gf would regularly come into the bathroom to pee while I was in getting ready. I knew what mine sounded like and she definitely always had more force behind her stream.

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psx_crab 19 points 10 days ago

Likely slower due to the friction the fluid have to go through the length of the barrel. The benefit however is the accuracy it has and lower in decibel, as it act as an aiming device and a suppresor.

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Fleur_ 7 points 10 days ago

I like this theory, diverting more funding to your research doctor

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TranquilTurbulence 2 points 10 days ago

Research like this deserves an Ig Nobel prize.

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LifeInMultipleChoice 6 points 10 days ago

Your penis makes noise when you pee? The only noise I've ever heard is when the urine hits water/leaves/grass..

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Nouvellalia 11 points 10 days ago

It sounds like a lawn mower in a kiddie pool full of spaghetti. Yours is silent?

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jdr 6 points 10 days ago

A kiddie pool full of spaghetti is one place I haven't yet tried peeing

Should I wait for the kids to get out?

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LifeInMultipleChoice 5 points 10 days ago

Mine sounds more like me looking at how hot it is outside and thinking maybe later. Mostly quite, but a potential groan everyonce in a while.

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Rappe 14 points 10 days ago

Now I'm sitting here wishing I had rifling in my barrel so the pee would come out spiraling like those nozzles on some power washers.

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FishFace 7 points 10 days ago

but the individual particles in the stream are going to follow a ballistic, not spiralling trajectory. I think the spiral nozzles have to rotate; they can't just be rifled.

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Rappe 1 point 9 days ago

I think they have a ball bearing on a groove, so the water pressure rolls it around in a spiral.

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Fleur_ 3 points 10 days ago

I want my dick to work like one of those tshk-tshk-tshk sprinklers

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Rappe 2 points 9 days ago

That sounds like post sex pee meets prostate problems.

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fruitycoder 2 points 9 days ago

Based in exp id wager you do not

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squaresinger 1 point 10 days ago

Oh, hell no, imagine the cleaning!

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rants_unnecessarily 1 point 10 days ago

A long time ago I read somewhere that the human penis is indeed rifled.

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village604 3 points 10 days ago

It's wrong. The stream twists because of the shape of the urethral opening.

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rants_unnecessarily 1 point 9 days ago

Doesn't that count?

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village604 2 points 9 days ago

No, rifling is spiraling internal grooves. The urine stream twist happens because of the opening shape and water's surface tension.

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PeriodicallyPedantic 2 points 9 days ago

I don't think it's a twist so much as an oscillation

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TownhouseGloryHole 12 points 9 days ago

Finally, a proper shower thought!

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ArgumentativeMonotheist 12 points 10 days ago

Time to harass my wife and compare speeds based on the sound of our pee streams. ✌️

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Fleur_ 10 points 10 days ago

Caution advised, I have just received a theory from one of your scholarly peers that a phallus may act as a scilencer thus making your method ineffectual. Perhaps pee upwards at a 45 degree angle and then measure the height of each stream to derive velocity?

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mlg 10 points 9 days ago

This is a toilet thought, please ban me mods.

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farmgineer 8 points 10 days ago

I thought most mammals had basically the same time (where diameter scales with bladder size) from a full bladder. I'm not sure if I'm misremembering that.

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jdr 4 points 10 days ago path: 0 25212833 25214214, hotness: undefined, score: 4, children: 0
thisisbutaname 3 points 10 days ago

It works for shitting, not sure if the same applies here but it's possible

defecation duration is constant across many animal species – around 12 seconds (plus or minus 7 seconds) – even though the volume varies greatly

https://www.scientificamerican.com/...

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rants_unnecessarily 1 point 10 days ago

After 20 minutes on the toilet. "Oh."

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idiomaddict 4 points 10 days ago

No

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wreckedcarzz 4 points 10 days ago

pew, pew!

I have no idea but the next time I pee PEW PEW

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A_norny_mousse 3 points 10 days ago

Of course there are other factors (how full and how big the baldder is etc.) but I do wonder if the diameter of the pipe is smaller in a penis, and maybe less stretchy/flexible, compared to vulva urethra.

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the_q 2 points 10 days ago

BPH says no.

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DampSquid 5 points 10 days ago

Beil Patrick Harris?

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Fleur_ 4 points 10 days ago

Broken petroleum hill?

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DampSquid 3 points 10 days ago

Bold Persephone Hologram?

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1800doctorb 2 points 10 days ago

Big ol’ Pumpkin Head?

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Iconoclast 1 point 10 days ago

Mine comes all the way from my head so the pressure is intense.

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taygaloocat -11 points 10 days ago

"People with a penis" do you mean Men? 😂

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Epidoxe 13 points 10 days ago

Some men don't have penises, some people with penises are not men.

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Fleur_ 9 points 10 days ago

Most of the time

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squaresinger 5 points 10 days ago

I knew a guy who had prostate cancer. They had to take his penis off. It's quite shit of you to insinuate that he's not a man anymore.

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SaveTheTuaHawk 3 points 10 days ago

Don't try and chase those goalposts around the field.

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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted clever little truths, hidden in daily life.

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