What does Religion say on the issue of a man's semen?

I don't know about religion, but Friedrich Nietzsche said, "The reabsorption of semen by the blood ... perhaps prompts the stimulus of power, the unrest of all forces towards the overcoming of resistances ... The feeling of power has so far mounted highest in abstinent priests and hermits" (quoted by Walter Kaufman in his clic, Nietzsche: Philosopher, Psychologist, Antichrist, p. 222