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Quick Answer. During a menstrual cycle, the blood may become dark red or brown near the end of the cycle because the blood is older and is not being released as quickly. This is a normal color change during a menstrual cycle, explains WebMD. Continue Reading.
Having dark semen is a sign of blood mixing in with the semen. This condition is known as hematospermia. It has many possible causes, including urethral stricture and a prostate infection. In the majority of men, the cause is unknown and the condition clears on its own without explanation.