some additional thoughts:
in addition to the physical stresses imposed on the penis I beleive the psychological stresses are another big factor to deal with.
I consider PE a sexually stimulating activity that does not usually include orgasm. Testosterone builds up to very high levels allowing more pe activity to produce more strength and size.
Sometimes I get too stressed out and am looking into zen type meditation and deep breathing excercies to lower the stress level. Some of this is caused by the supplements that I use such as tribestan and yohimbe but they are very good for increasing blood flow into the penis and I plan to continue using them for a while.
My gains are less than some guys here but I am basically satisfied with what I have achieved. You may reach your goal faster than you plan, so don’t get discouraged and do read the threads here. There’s a lot to learn.