Did it ever occur to you that after four months now you're probably not gonna get the answer you're looking for and maybe you should try posting on a different forum. Not trying to be an ass i'm just saying.....
Or maybe no one here has that problem. I've had that problem in both sex and masterbation but I learned that it was a side affect from the anti-depressants I was taking. As soon as I got off them it was like someone turned on the faucet, I couldn't stop. There are lots of other types of medications out there that have the same side affect.
It might just be me, and no offense intended whatsoever, but I suspect that your persistence is driven by the fact that you find this subject 'stimulating'. You may or may not have this problem, but somehow get satisfaction by reading about it. :2 cents: