Why would someone shake while they are kissing and feeling someone?

Shaking and shivering during a kiss or caress is a combination of nervousness and excitement. Usually it would only happen during the first couple intimate moments and happens less often when comfortable around the person. The person is probably really excited but nervous about advancing to a new level of intimacy. Shaking and shivering during a kiss or caress is a combination of nervousness and excitement. Usually it would only happen during the first couple intimate moments and happens less often when comfortable around the person. The person is probably really excited but nervous about advancing to a new level of intimacy.