I found this link to be very interesting, and somewhat alarming.
It points to soft tissue damage..
http://groups.g oogle.com/group … ea58e54091e705e
In particular..
\"Theory is that after some prolonged masturbation, we
Damaged the soft tissue in our penises. The damage may not have been
Severe as fibrosis, but an intermediate condition between healthy and
Damaged soft tissue. This prevents our soft tissue from properly
Relaxing when it needs to and results in erectile dysfunction.
When we have a lot of phsycial stimulation, more blood is forced into
The penis. However, the penis fails to seal this blood off, becuase
The tissue is damaged and cannot fully relax. We therefore cannot stop
The ‘physical pumping’ required to keep the erection. That is why when
We stand up or let go, our erection collapses.
The feeling of pressure or ‘tightness’ also comes from the soft tissue
Damage because the smooth muscles are not able to relax properly.
Perhaps they are in some state of ‘contraction’, whcih is why they
Feel tight. This feeling of ‘contraction’ (as opposed to relaxation)
Is also why we can’t get proper erections. Also, before all of this,
When we need to go to urinate, we would often get an erection (this is
The over-filled bladder theory and is why we usually get erections
When we need to urinate in the mornings - morning ‘glory’). Instead,
We feel tightness, because as the blood rushes in and the smooth
Muscle will usually relax, the damage prevents it from doing. The
‘Contracted state’ is felt as a "tightness". This damage is also why
We don’t feel that as much sensation during sex.
The slightly increased firmness of the penis in the flaccid state also
Could result from this intermediate condition. The soft tissue damage
Prevents an Erection because the muscle tissue can not fully relax.
However, it also means that the muscle tissue cannot fully contract to
It’s normal state and is stuck in between. Therefore, the penis will
Appear to be slightly bigger, or firmer. The most extreme form of this
Is fibrosis, where the cell cannot relax or contract, making the penis
Hard in a flaccid state, and making erections difficult. Our damage is
Intermediate andt therefore not so severe."
(Quoted from above link)