Why do guys shake (or shiver) when they hug a girl or get hugged by a girl?

kimichi120
my boyfriend hugs me a lot and he awkwardly shivers a bit lol, well a lot. its awkward, yes, but i kinda find it adorkable. he even shivers whwn he cuddles with me. someone, please explain this. pleaseee.
Why do guys shake (or shiver) when they hug a girl or get hugged by a girl?
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