Crunchy, your story sounds identical to mine-- right down to it's location on my penis and a possible link with issues regarding sex/sexuality-- except that I developed Psoriasis at age 18 and have had it in the same areas for 14 years now (I'm assuming you're quite a bit younger than I if it just started in '04).
My question is, is the 50% reduction in the groin area too? I have cleared my dandruff in the past but never in the groin region. Do you drink? Interestingly, my first flare-ups occurred about 1-1.5 years after I began drinking alcohol, so I think that could be another related issue.
Also, do you only drink the urine or do you apply it directly to the rashes on your penis?
Wow-- talk about personal questions! Thank goodness for the anonymity of the internet!