Good question fluff. One of the curses of us males. The balls themself don't actually turn blue. Gather round boys and girls for the explanation.
When a man becomes sexually aroused, blood flows into his penis and testicles (or balls). If he ejaculates, the blood flows out of his genitals more quickly than if he does not ejaculate. The discomfort men can feel when they have been sexually aroused but have not ejaculated is sometimes called "blue balls".
And I can tell you from experiance...its no fun being in this state.
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