An attempt to model LOT
I’ve been puzzling over LOT theory for a while, so I set out to construct a mechanical model that would help me understand it. Here is the model.
I have no formal training in anatomy or medicine. I currently believe but am not confident that this model represents reality. I am hoping that others will take a look and comment on the accuracy.
You’ll understand the model better by looking at the following figure (this is the first time I’ve attached a file, so it may appear at the bottom): LOT.jpg
The figure shows three simple drawings of a penis being subjected to stretching force from different angles. What’s identical across the three drawings are the positions of the bones to which the various penile structures attach. These bones are shown roughly, as circles, toward the right of each drawing. The top circle in each drawing represents the pubic symphysis, which I believe is the bone to which the suspensory ligament (or, at least part of it) attaches. Below that and slightly to the right (i.e., more internally to the body) is another circle representing both sides of the ischiopubic ramus. These, I believe, are the loop shaped bones that we sit on. From what I’ve read, the crura (i.e, separated internal portions of the corpora cavernosa) are anchored to the bottom parts of these bones, one to each side.
The penis itself includes numerous tough fascia and other forms of connective tissue. These include Buck’s fascia and the tunica albuginea. From what I’ve read, these tissues extend inside the body and attach to the perineal membrane in the perineum. Within the penis, they appear to attach just below the glans. For purposes of the figure, the perineum is essentially in the same spot as the bottom circle, i.e., the ischiopubic ramus.
Now that I think I have a handle on the structure, how does it work? Here’s what I’m thinking. Kegeling flexes the PC muscle and pulls on the perineal membrane. This, in turn, pulls on the tunica and fascia, which in turn pull back on the head of the penis, assuming the penis is fully extended.
As the figure suggests, Kegeling pulls back on the head of the penis as long as the tunica and fascia are bearing the stretching force. This is not the case, however, when the suspensory ligament is taut. Under this condition, the tunica and fascia (or, more correctly, the portions inside the body) remain lax. Kegeling at this point will generally not pull back on the head (i.e., because it’s pulling on a lax string).
Of course, changing the angle of the stretching force varies the tension on the suspensory ligament. The lower the angle, the tighter the ligament.
If I’m seeing this correctly, this model can explain Loss of Tugback, or LOT, as follows. Simply, LOT occurs at the angle at which the stretching force shifts from the tunica (and fascia) to the suspensory ligament. Tugback is lost because the suspensory ligament limits the penis’ extension, so that the connection back to the PC muscle becomes lax. Essentially, the PC muscle can’t pull back on the penis far enough to pick up the slack.
Some interesting observations flow from this model. First, you would not expect LOT to be abrupt (i.e., either it’s tugging back or it’s not, with no in between). Rather, LOT should be gradual. As the penis is pulled at progressively more downward angles, the suspensory ligament should gradually tighten. As it tightens, tugback should diminish from a maximum value (I’m guessing 2 or 3 mm) down to zero.
Second, it appears that erect length can only be increased by stretching the tunica and fascia (or, to say it more accurately, by stretching the body of the penis itself). It seems from the model that stretching the suspensory ligament will only affect the amount of penis revealed below your LOT. Above your LOT, your ligs are out of the picture (lax) and do not limit your length. At least on the surface, this suggests that downward vertical hanging may not be as effective as hanging at higher angles, for maximizing erect length.
But it also appears that the suspensory ligament cannot be stretched without also stretching the the external portions of the tunica and fascia, at least along the top surfaces where the suspensory ligament attaches. So even downward hanging will probably help somewhat with erect length.
The information on anatomy that I used for this model was obtained from Boston University Medical School’s website at
I’ve also found some wonderful pictures at http://www.med.uottawa.ca/medweb/de…2_crs_lec02.htm
As a postscript, while studying the anatomy for this post, I think I found some contradictions in the definition of “tunica.” The BU site refers to the tunica as the sheath the surrounds all 3 corpora of the penis. However, the Ottawa site identifies it as the separate sheaths that individually surround the corpora. The envelope surrounding all three is identified as Buck’s fascia. Check it out.
Last edited by ModestoMan : 08-11-2004 at .