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What is the underlying mechanism of post PE cold penis, and is it bad for gains?

What is the underlying mechanism of post PE cold penis, and is it bad for gains?

This is another PE phenomenon I think is worth investigating to clarify how PE works.

I think it’s probably bad, but I am not sure. I haven’t noticed a correlation between post PE cold penis and growth rates, but I haven’t really looked at it closely. It seems like reduced blood flow is the cause, and reduced blood flow I think causes collagen upregulation (which I think is probably bad), but sometimes that kind of logic doesn’t apply because of some unknown.

What causes post PE cold penis?

Pumping flaccid seems to reliably cause this. I remember this occurring after long jelqing sessions and clamping as well in the past. I’m sure heat is a factor as well, since heat seems to resolve it, not necessarily transient heat from a warm down though, but heating through insulating the penis with something like a sock.

What is the mechanism behind post PE cold penis?

It is sort of baffling to me. Shear stresses from PE should increase blood flow. It does seem to be caused by reduced blood flow to the CC and CS since the glans is cold, not just the skin with edema. But perhaps it’s only reduced blood flow to some areas of the penis and not all. Perhaps the vascular tension of arteries and capillaries is reduced causing blood to enter the CC and CS at the base, but rapidly leave it through over expanded veins instead of traversing the whole length of the penis.

It could also be that the arteries have constricted for some reason.

Since I don’t have a way to do a blood doppler test right now, I can only speculate and make more observations. I think I might try to cause post PE cold penis and check my penis perineal shaft for signs of heightened or reduced blood flow.

But suppose it was causing a heightened flow of blood through the pudendal artery, just not to the entire penis, could that be a good thing for remodeling that artery to have a higher diameter?


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.

Definition of conditions and the identification of variables matter here.

How might we define “cold penis”.


Once upon a time (2015): 6.40” x 4.50”

Today: 7.25” x 5.00”, Thunder Cocks Unite!

I think we can...Little Engine’s Climb

Originally Posted by LittleEngine
Definition of conditions and the identification of variables matter here.

How might we define “cold penis”.

Right, I’m not sure what all the variables that cause it are. I seem to be able to reliably reproduce it with 20 minutes of flaccid pumping at 5 inHg not followed by edging or a warm down.

I would define post PE cold penis as a cold penis following a PE exercise that persists for 1 hour or more without intervention (warm down, insulative heating, shaking) at 20-25 degrees Celsius (ambient room temp). This definition might not hold out with more observations, but it seems like a good starting point.

I also remember it occurring in the past from long jelqing sessions, long clamping sessions, and maybe long stretching (it’s been a while so my memory might not be accurate).

It does seem to be due to reduced blood flow to the distal penis since when I checked recently I could not detect a pulse in the glans, but at the base and perineal CC I could detect a pulse. Unfortunately, I can’t fit the glans in a finger pulse oximeter, and maybe my manual pulse check isn’t that accurate. Oximeters are calibrated to correlate peripheral light absorption of the finger with systemic oxygen, so it wouldn’t necessarily translate to the penis anyways, though I could take a baseline flaccid SpO2 and try to make a conversion factor for the penis. Since I have only one oximeter right now and may need it, I won’t be taking it apart to fit on the glans.

The cold penis phenomenon seems distinct from what I’ve been calling the contraction response, since it doesn’t seem to correspond with a shortening of erect length.

Since I’ve been thinking about it a little now, I’ve got two tentative mechanisms: mechanical hemolysis and premature O2 release into arterioles.

Mechanical hemolysis doesn’t seem likely (I’m not an expert in the shear stresses or compression needed for hemolysis) with 20 minutes of flaccid pumping, but it makes some sense when it comes to jelqing though there are problems with that hypothesis too. Red blood cells are easily lysed, they release free hemoglobin, which interacts with NO to form nitrate (inactive for vasodilation). It’s known that mechanical hemolysis occurs through repetitive movements in runners and drummers, it’s possible the free hemoglobin has a localized effect in the penis because the penis is a vascular bed, erection can slow the flow of blood out of the penis, and blood can reflux (go backwards) into the arterioles.

Premature 02 release into the arterioles makes more sense. If the capillaries are distended past their normal capacity, perhaps they take time after force is removed to reduce in diameter again, and in the mean time the increased diameter without corresponding up stream or down stream veinous or arterial dilation could cause the rate of blood flowing through the system to slow, causing premature 02 release in arterioles. O2 is a known vasoconstrictor of arteries. Maybe flaccid pumping is particularly good at causing this because it distends capillaries without increased blood inflow. Normally capillary dilation causes upstream arterial dilation through endothelial signalling, but it’s chemical or electrical signalling which maybe flaccid pumping doesn’t initiate. Perhaps 02 caused constriction in arterioles can persist for a while?


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.


Last edited by Sigmoid : 05-13-2020 at .

I tried pumping with an erection, but not doing any edging or warm down, and it also produced post PE cold penis. So I guess it doesn’t have to do with pumping flaccid, but just not restoring blood flow post pumping. It did seem to be a less severe case of cold penis since it was warm further up the shaft and I could feel a pulse further out on the shaft. Also, the onset of cold penis was delayed by about 20 minutes after pumping.

Since I’ve only done a few tests to replicate this, some of the features of this might not be consistent upon reproducing the experiment.


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.

Originally Posted by Pe_is_an_art
When you have this post PE COLD FLACCID is it always smaller in size than the normal termperature flaccid?

I don’t think I’ve been paying enough attention to the flaccid size to really answer this question. I have had instances of post PE cold flaccid where size was noticeably smaller in the past, but I think generally the flaccid size is larger due to the edema or semi erect CC. I think that the flaccid length during post PE cold flaccid is generally shorter, but I just haven’t been paying enough attention to it to be confident in that answer right now. Part of why I don’t feel like I know the answer is that flaccid size can vary so much throughout the day, it’s hard to know what normal is for something like that.

I pump every other day (sometimes I skip a day and I’ve done a few tests of higher frequency pumping recently) and have done so for several years mostly without fail, so I might not have a good perspective of what a normal flaccid size is at the moment also.

It’s also possible my brain isn’t working that well right now and I just can’t access all my memories, brain fart.


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.

The only logical explanation is that there is a restriction of blood.
More blood = hotter
Less blood= colder

Like when we are extending and after some minutes the glans are becoming cold because the strap is limiting the blood flow there.
A 5 mins massage under the hot air of a space heater can solve this faster than letting it cold without doing anything.

Originally Posted by Pe_is_an_art
The only logical explanation is that there is a restriction of blood.
More blood = hotter
Less blood= colder

Like when we are extending and after some minutes the glans are becoming cold because the strap is limiting the blood flow there.
A 5 mins massage under the hot air of a space heater can solve this faster than letting it cold without doing anything.

Yes. I’ve actually had good luck restoring blood flow with insulation (putting a sock on it) better than transient external heating though.

But I just don’t know what causes it and if it’s bad or good for PE. I assume it’s bad, but I’m not sure. Something about it stands out to me.


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.

Originally Posted by Sigmoid
Yes. I’ve actually had good luck restoring blood flow with insulation (putting a sock on it) better than transient external heating though.

But I just don’t know what causes it and if it’s bad or good for PE. I assume it’s bad, but I’m not sure. Something about it stands out to me.

I also don t think is a good thing.
But as long as your Pis are good and the temperature is restored fast with the rice sock and it remains after the rice sock in a warm temperature I don t think its really bad.

Originally Posted by Pe_is_an_art
I also don t think is a good thing.
But as long as your Pis are good and the temperature is restored fast with the rice sock and it remains after the rice sock in a warm temperature I don t think its really bad.

I agree. It’s concerning to me when it happens. In my case, it’s usually when I’m not giving my penis enough recovery between sets or not taking a break between exercises at all

I sometimes get cold flaccid after long PE/pumping sessions. If I stay under 40 minutes of time in the cylinder (at mostly 10-minute intervals in it) then I’m more plump and it just feels like a ‘normal flaccid penis’ to me. But if I push more time, especially 60+ minutes of tube time, I am quite smaller flaccid and its a bit cold to the touch. The glans is very cold. The skin on my shaft is extremely tight during this too. I wish I could have paid attention to this more through the years! I’d say it lasts like 30 minutes or so, sometimes a little longer. If I rub it and kind of jerk it dry and squeeze it I can tell it warms up a little, like blood is moving more, but sometimes it does not get to normal temp for several more minutes.

My thought on this over the years has been that my penis is just tired of having so much blood forced into it against its will for so long and it needs a “blood break” or something like that!!! This never hurts my erections afterwards; although, if in the odd chance I decide to get hard within 10 minutes of pumping then it does help the cold leave. But I don’t always get hard after I pump because my cock is a bit tired out. Just my thoughts on this! Sigmoid, thanks for addressing this as I too wonder what its all about and what it means for gains.


Starting length, Spring 2003: bpel 6 3/8", bpfsl ~6 1/2", flaccid ~3-4" (never measured flaccid stretched or hanging flaccid; starting girth was probably ~5"-5 1/4")

Summer 2004: bpel 7 7/8", bpfsl 8 1/8", flaccid ~4", erect girth 5.3"

Spring 2018: bpel 7 1/4", bpfsl 7 5/8", erect girth 5 1/8"; Spring 2020: bpel 7 3/4", bpfsl 8", erect girth 5 3/8". Current - August 2021: bpel 7 3/4", bpfsl 8", erect girth 5 1/4"

Originally Posted by pumpedmember
I sometimes get cold flaccid after long PE/pumping sessions. If I stay under 40 minutes of time in the cylinder (at mostly 10-minute intervals in it) then I’m more plump and it just feels like a ‘normal flaccid penis’ to me. But if I push more time, especially 60+ minutes of tube time, I am quite smaller flaccid and its a bit cold to the touch. The glans is very cold. The skin on my shaft is extremely tight during this too. I wish I could have paid attention to this more through the years! I’d say it lasts like 30 minutes or so, sometimes a little longer. If I rub it and kind of jerk it dry and squeeze it I can tell it warms up a little, like blood is moving more, but sometimes it does not get to normal temp for several more minutes.

My thought on this over the years has been that my penis is just tired of having so much blood forced into it against its will for so long and it needs a “blood break” or something like that!!! This never hurts my erections afterwards; although, if in the odd chance I decide to get hard within 10 minutes of pumping then it does help the cold leave. But I don’t always get hard after I pump because my cock is a bit tired out. Just my thoughts on this! Sigmoid, thanks for addressing this as I too wonder what its all about and what it means for gains.

It’s probably a good sign the blood flow is restored around 30 minutes after.

Back when I was clamping I would go to sleep and wake up because of a cold feeling in my penis. I could get it warm again by shaking it for about a minute and a half or heating it, but that alone didn’t reliably keep it warm and it would go cold again. I eventually tried using a sock for extra insulation and that has worked reliably to restore the blood flow, or at least keep it from going cold.


Starting: 7"bplx5.2" 2017 (shrunk from disuse)(originally 8"bplx4.5", gained to 9"bplx6")

Current: 9.0"bplx6.125" 2020

Goal: 11.5"bplx7" 2021.

Originally Posted by Sigmoid

Back when I was clamping I would go to sleep and wake up because of a cold feeling in my penis. I could get it warm again by shaking it for about a minute and a half or heating it, but that alone didn’t reliably keep it warm and it would go cold again. I eventually tried using a sock for extra insulation and that has worked reliably to restore the blood flow, or at least keep it from going cold.

Sounds dangerous.

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