What is happening when I block my cum?

Sometimes I will masturbate and upon summing, press the underside of my penis tightly, blocking the cum just below the base of my penis.Nothing comes out afterwards. What is happening here? Get your own Orgasm Control toys: For men: http://www.amzn.to/1V6XQvv For women: http://ift.tt/1UWn54n

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