Nerves cause our muscles to tense up, but we try to loosen them consciously. However if you are still nervous you're fighting your body's instinctual impulses and you ened up shivering. I can think of several examples of this. When I go rock climbing if I'm standing on a precarious footing and feel I could slip and have my foot planted in against a little crimp grip to keem myself on my leg stargs shivering like mental, it's a syndrome affectionately called disco leg by climbers. When I'm in a staff meeting at the front row and the principal of the school is right in front of me talking to us and I'm not feeling overly confident I get get it in my back, especially after one too many coffees.
Thirdly and most relevantly is when I'm turned on. One time in Rome while on holidays with this American HB9 she tied me to the bed and was doing all sorts of freaky shit. Before she fucked me she had me so turned on I was shivering like mental.
Oh wait, one more example. When I lick girls out their legs shiver like crazy. It's natural, it'll happen when you're having sex some times. Don't worry too much about it. It's not an illness.
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