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Did you know that when a girl sucks a dick, what actually happens is that she reduces the air pressure inside her mouth such that it creates a vacuum, which is a difference in pressure causing stress on an object to fill said vacuum. So actually she isn't sucking the dick in, it's earth's atmosphere that is pushing your dick into her mouth. The same principle applies to drinking from a straw in which the difference in atmospheric pressure you create in the straw allows the water to expand into it. Your dick is doing the same thing as the water.
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