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The Sphincter Thump is a more humane / less illegal derivative of the Donkey Punch. While fuck'in Doggy Style the man reaches down and thumps the woman’s anus as hard as he can with a flick of his finger. The reaction is that the woman tenses up and greatly enhances the mans climax. (*Note the most effective thump is to bend ones middle finger back using the thumb on the same hand. Once cocked aim for the Brown Eye and let it fly).
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