Condom pumping

My greatest appreciation to all the folks who’ve kept this thread going. I would never have been curious enough to look into pumping had it not been for this thread popping up every time I pulled up the “latest posts” link.

I’ve been at this (pumping in general) for about a week or so, and I first wanted to try pumping without the condom. I kept to 5” Hg and did notice both fluid build up and “spongy” erections. I then tried with a condom and one thing came to my attention.

I fucking hate condoms.

How the hell do you people do it? I can pull a stiff one when I’m not thinking I need to pull a stiff one to pull a stiff one. In other words, I go soft when I either have to put a condom on, measure myself, take a picture of myself, flash some of my wife’s friends, get in a hot tub with 17 of my closest friends, etc.

The few times I have been erect enough to put a condom on, I immediately go soft and stuff it into the tube. From there I pump to 5” Hg. The feel is definitely different. Very little fluid buildup and the spongy erection seems to be gone. I say seems to be because I’ve become paranoid now.

I do have a question though…

…is where I’m puzzled. The pressure of the tube, say 5” Hg must be equalized within the system. (I know I’m getting the terms wrong, it’s not pressure but vacuum we’re talking about).

Without a condom, the vacuum is applied directly to the skin. The skin stretches out enough to equalize 5” Hg (it’s own tensile strength). Underneath the skin, for the sake of simplicity, lies the tunica. The system between the tunica and the skin, during an erection without the tube, is stable (ie the skin pushes down on the tunica to prevent further expansion). The minute you apply the vacuum, the skin does not put pressure on the tunica and the tunica is free to expand further.

[On a sidenote, the penis ceases to engorge further bacuse the tunica is stretched to the point where the pressure inside (the carnevosa) equals the tensile force being applied by the tunica. The skin, I believe, plays a minor role.]

There comes a point where the tunica needs to stop expanding because of it’s own tensile force. Once that point is achieved, and the skin is still retracting from the tunica, the system needs to stabilize itself with lymphatic fluid. Enough fluid comes in to fill whatever space needs to be filled.

With a condom, the fluid does not need to come into play as much because the condom pushes in to equalize the point where the tunica ceases to push out.

This is the point where my brain collapses. Everything I’ve said applies to the side to side (or lateral) axis. Lengthwise, or longitudinally, the force is equalized by the septum and the ligaments, not the skin. Since the condom is not anchored in this direction, the penis negates the pressure internally.

I’m thinking as I write this, so please bear with me. I believe, the pump/condom combo really diverts the stress on the penis more on the length axis and less on the width axis. Correct?

Just as an FYI (because I’m a nerdy geek), our atmosphere is 29.92” of Hg. When we inflict 5” Hg on the dial, the pressure in the tube is really 24.92” Hg. 1 atm = 29.92” Hg = 14.7 psi = 761.84 mm Hg. Lastly, 1” Hg = 0.49 psi

Yeah. I sort of backed down from this statement after I made it. Like you, I was trying to muddle through this process as I wrote the post. My reasoning was that the condom is essentially open at the bottom, so air can flow in and out freely, thus equalizing the pressure.

But on second thought, I began to see that the base of the condom may actually form a partial seal with the penis, so that it would impede the flow of air and thus be able to sustain a pressure difference inside to outside.

I think your explanation above is getting very close. I’d like to suggest a slightly different spin, however.

I wouldn’t say that lymph “needs to” flow in between the skin and tunica without a condom, only that it “may” flow in if there’s a relatively unimpeded path. If lymph does not flow in (as some have reported who enter the tube totally erect), then I’d expect the vacuum pressure applied to the skin to be essentially transmitted directly to the deeper penile structures (assuming the skin is itself expandable). This means that the vacuum is applied without much reduction directly to the outer surface of the tunica.

The vacuum is “transmitted” to the deeper structures because the skin is encouraged to expand outwardly under the vacuum. I believe the skin is relatively elastic and can expand fairly easily. However, the expansion of the skin causes a vacuum to develop inside the penis—between the skin and the deeper structures, including the tunica.

If lymph is available, it will flow in to fill the void. But if it is not, the skin will simply pull on the outer surfaces of the deeper structures. The toughest structure will end up bearing the majority of the pressure difference. So, for example, if the skin is perfectly elastic, the tunica or other tough internal membranes will bear the entire vacuum pressure.

This seems to be exactly what one would want—for the vacuum to pull on the deep structures.

Lymph undermines the whole pumping process by filling the void between the skin and deep penile structures and bringing the pressure at this layer to nearly body pressure (1 ATM). The lymph thus decouples the vacuum from the deep penile structures and screws up everything (except for length pull, which is not affected by lymph).

The condom helps by impeding the flow of lymph. Without lymph, the applied pressure of the vacuum stays concentrated on the deep penile structures. The applied pressure is not neutralized by the lymph.

This line of reasoning raises an interesting question: Can you get most of the benefits of condom pumping simply by wearing a cock ring? In other words, is the constricting effect at the base of the condom enough to achieve the desired effect, or is necessary to squeeze slightly over the entire length of the shaft?

By the way, I haven’t totally abandoned the “squeeze” theory I had proposed awhile back. It’s still interesting to me, but I don’t really have the bio background to take that much further.

Anybody out there know how cells respond to pressure??

I couldn’t understand the squeeze theory until this morning. I think I understand it as: Take a balloon with very little air and squeeze it, then add more air into the balloon, the balloon juts forward instead of outward. In essence when the pressure drops (in the tube) the imbalance between internal and external pressures is similar to adding air into the balloon?

If that were the case, isn’t that the same as packing the tube girthwise? No where to go but forward.

Muttley,

Take a partially inflated balloon that’s tied off at the end. Squeeze it in the middle (half way between the “nipple” and the top). What happens?

The balloon gets bigger in the areas that you’re not squeezing. Also, the air pressure inside the balloon increases (because it’s overall volume decreases).

This is exactly what happens when you clamp your penis. It’s also what happens (slightly) when you squeeze your penis by applying a condom.

Now, if you’re clamping (or squeezing with a condom) while you’re also pumping, you add to the overall effect. The vacuum decreases the pressure in the environment of the penis, while the pressure inside the penis stays at its elevated (clamped or squeezed) level. Consequently, the pressure “difference” between the inside of the penis and the environment (the cylinder) increases, causing a greater stretching effect on the penile tissues.

At least that’s how the theory goes :) .

Huh, very interesting thread. I have been experimenting with pumping while clamped with decent results. I have gotten much less fluid build up when clamped, however, it takes longer to start packing the tube. Overall, I feel this has some advantages as I am targeting the penis two-fold.

The fact that you’re not packing as quickly while clamping is probably a good thing.

The clamp blocks the access path of lymph into the penis. It prevents the penis from flooding with lymph and bloating, and therefore (I believe) keeps the vacuum pressure concentrated on your deep penile structures.

One of the main points I was trying to make above was that lymph undermines the effects of pumping by flooding the penis with fluid that’s at about 1 ATM (body pressure).

An interesting (to me) afterthought: There is always some resistance to the flow of lymph into the penis. It’s relatively low without a clamp and relatively high with one. As long as your skin is perfectly elastic, the lymph inside your penis will always be at vacuum pressure (I think this is the opposite of what I said above). Only when your skin maxes out and can’t stretch any further will the pressure of the lymph approach body pressure (1 ATM). THere will be a transitional region, at which the expansion of the skin slows down, where the pressure of the lymph crosses from near vacuum pressure to near body pressure.

Revised punch line: Lymph only undermines the effects of pumping on the deep penile structures when the skin on the penis significantly resists further expansion under the pressure of the vacuum. The pressure of the lymph is at the half-way point (between body and vacuum pressure) when the resistance of the skin to further expansion exactly equals the resistance of the penis to the flow of lymph. I think that’s more accurate.

Do you think that is the only fluid path for lymph. I ask because during my early days of extreme ulis, I didn’t use any weight. I did however get some lymph build up. Because I didn’t use weight, the clamp didn’t move forward. I think there must be another source for the fluid buildup. For this reason, I still think my original hypothesis is at least partially correct.

Hi guy’s, it’s been a while but I have to ask…I had a pump years ago that came with a thick rubber sleeve. It was just like a thick ass condom. I wish I knew how to pump then because that would work like a charm. I have searched for pump accessories (I think it was a jel-lee product) but found nothing.

Does anyone know what I’m speaking of, or know where to find one?

If it is a bottom seal, I know what you are talking about but I can’t remember the name of it or who sells it.

Different from a condom, actually, in practice because I think the thing you are talking about can act essentially like a cockring. Or do I have it all wrong?

No, the base of it would be too loose for a cock ring effect. It wraps up the outside base of the cylinder.

I think I know what you are talking about. Is it a half donut like seal that covers both the bottom outside of the tube and in-volutes to cover the base of the penis?

If so, I don’t think this will work. I think you need a full condom or at least something to cover most of the shaft.

No, what I’m talking about covers the whole penis.

Oh, that sounds very cool. A thick condom might still work better though because of the cock ring effect at the base.

Lymph may have an internal path, but there’s really very little room. There’s no space between the two CCs, and very little between the CCs and the CS. The CCs and CS are closed structures, which are probably fairly impermeable to lymph. So I think the primary path for lymph is probably just under the skin; however, I would be eager to learn something new if you find this isn’t true.

Anybody seen a penile anatomy drawing that shows lymph ducts?