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If men commonly masturbate, will this affect future human evolution by...? - unused sperm in period

If people do not ejaculate during the periods, increases the reproductive organs unused sperm. However, if people continue to masturbate as often as today, that many future generations, the recording mechanism of sperm in the male body functions gradually lose this mean? If so, can you explain why men today tend to develop prostate cancer, if not ejaculate regularly?