remek, something I noticed from the PDF anatomy file you attached. Take a look at the illustration I attached from it (I added the red circle and line.) As you quoted from the article it says,
Quote:
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"In the human penis, the skeletal ischiocavernosus muscles, the bulbospongiosus muscles, and their extension as the tunica albuginea"
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Notice that the skeletal muscle portion is very prominent at the base but does not extend up into the shaft. It the illustration on the right (in the original pdf file) you can see that the muscles do not extend past the pubic bone. The tunica extends from the muscle just like a ligament. So, it looks like the actual penis shaft contains very little skeletal muscle extending from the base. But the base itself most definitely does. This could very well explain why hanging is reported to increase base girth. Could it be that these two muscles are enlarging to support the added weight? What do you think?
I agree, it would be nice to get some Phd's over here.