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ADutchExpression t1_j6hgvqz wrote

In a nutshell. The D fills up with blood, usually when aroused or stimulation is present. And yes they do happen unintentionally at times this can make for some very awkward situations.

The things filling up with blood are called the Corpus Cavernosum.

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Ancient_Skirt_8828 t1_j6hi319 wrote

You also have “valves” that close to stop the blood flowing straight back out again.

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