This may be a shot in the dark, and my desperation is clouding my judgement, but I think I found a solution, self inflicted retrograde ejaculation.
http://www.nlm.nih.gov/medlineplus/ency/article/001282.htm
No semen coming out, no POIS. Semen ejaculation and not arousal itself is the problem, so intentional retrograde ejaculation may help?
Please comment.
Others have found this helps them as well.
It's very strange though, for myself (and others) retrograde ejaculation severely worsen our POIS.
Of course I'm not saying that you are wrong, just that there seems to be such differences between us.
One possibility is that in us all, there may exist a weakened area of the urinary tract, but depending
where it is, effects the bettering or worsening of the symptoms.
Perhaps for you, retrograde ejaculation bypasses the "weakened area", in my case, it directs the semen
exactly to the "weakened spot".
Who knows? It's all so strange.
But at least we are on a path to forming a clearer definition.
It's sure the the research may or may not find the specific cause immediately, but it's better than
imagining that high doses of cyanide or salt or vitamins or DNA tests will resolve our problems forever.
We are putting the best experts possible in POIS research to the task. And there are MANY of them.