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Masturbation causes "blue balls"?

Blue balls is another slang expression. It is a normal part of the sexual arousal of a man to have a higher blood flow in the genital organs, including penis and testicles ("balls"). Ejaculation usually causes a reflow of the blood into the body. If a man is sexually stimulated but has no ejaculation this might cause a decreased reflow of the blood. This might cause some discomfort and sometime a darker /blue color of the testis. However, there is more myth than reality to "blue balls". Since masturbation will give an ejaculation there is no reason to expect this might happen.  And even if there is some discomfort from not
ejaculating, that will pass rather quickly.
MYTH (mostly)