Why would a guy shake/ tremble when kissing a girl?

GeekyChic
I have a friend with benefits, it's been about 15 months. The last 6 or so months though every time we get close, cuddling kissing - not sex. He starts shaking like he's cold, he says he's not and he isn't sure why he does it but I should take it as a compliment. Why would he do that?
Why would a guy shake/ tremble when kissing a girl?
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