The Unexplained Phenomenon

Now I've discussed this particular natural occurence with some friends and although some rather humourous explanations have been given I don't believe any scientific answer has ever been put forth. What I speak of is the piss shiver. I'm unsure if women ever suffer from this seemingly random event, however I know most guys know exactly what I'm talking about as the name says it all. If nothing else I would guess that it is the main culprit for mens' reputation for having bad aim when using a toilet.

Some of my favourite theories to explain the cause of a piss shiver:
1) Mini orgasm- Since the wang has two functions is it possible that during urination something is triggered causing the body to react in a similar way to the second function? Now I'll admit when forced to hold it, my pee not wang, that when I finally get to go, it is one of best feelings in the world. As I believe both genders can agree on. But I can't say for sure that the occurence of piss shiver increases at these times, which one may expect to happen if the mini orgasm is true. Also the fact that piss shiver happens only about 2-3 times per week seems to go against the idea of mini orgasm.
2) Rapid loss of warm fluid (RLOWF) - This theory seems to make sense. One is feeling good, then there is a RLOWF and one may shiver as their body suffers a rapid cooling if you will. However, if this theory were true wouldn't women then also suffer from piss shiver? Also wouldn't a similar shiver occur when throwing up? Though upchuck isn't nearly as warm I'd imagine that your body would still lose a considerable amount of heat during the process.
3) Result of exposing the nether region- This may explain the gender bias of the piss shiver. The male junk is infamous for its unforgiving sensitivity. Just ask any man who as swam in cold water, had his junk grazed by with a passing object or has been downright sacked. But piss shiver has been observed in diapered babies and for that matter diapered geriatrics. Not by me personally, but by more devoted spirits to the piss shiver cause. I can also attest to the fact that I probably get a good piss shiver in the middle of a hot summer just as often as I do during the winter.

Now I've been sitting at my desk and have gotten a chill from time to time and shivered. And I've been left thinking where the hell did that come from. This event seems rather normal among everybody. When I was little I was told it happened because somebody 'walked over my grave' . But why does it seem the occurence of a shiver dramatically increases during a tinkle? Is it because I just happen to be more focussed? Maybe its because the effects of piss shiver are more noticeable than your run of the mill shiver. I guess until someone can come up with an explanation us men must be prepared for anything. But don't let the fear of piss shiver overwhelm you. I'm pretty sure thats why urinals were invented. Nothing better then getting a good piss shiver while at a urinal and you can take full advantage of all the space.

Please leave any ideas and explanations or possible preventative methods. And girls if you ever get piss shiver let us know, anonymously is prefered, as it could be useful knowledge.