Could it not be that the shiver is from the release of endorphins fromhaving completed a natural process? We get one when we f**k, why not when we pee. We have saved ourselves from urinary tract infection, and mild to moderate pain from the pressure. Perhaps our body is rewarding us for doing so. This is akin to the orgasm theory, but provides an explanation for why.
“C’mon, it’s not even tomorrow yet…” - Rupert
If you need a graphic solution, http:\ alk.to\Piglet