Guys, why do you shake hands really lightly with girls?

Anonymous
At church every week my pastor tells us to say hi to people around us before we sit down and so every Sunday I turn to the people behind me and in front of me and we shake hands and say good morning. I notice that almost every single time guys I shake hands with do it so lightly. They basically just hold my hand for a second and let go instead of really shaking my hand. I don't mind, but I wondered why do guys do that and do they do it to every girl or not?
Guys, why do you shake hands really lightly with girls?
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