Sperm: 15 crazy things you should know
Men produce sperm all day, every day - throughout their lives. But because so many start their journey, plenty make it to the egg. Why can't we just appreciate sperm for the amazing little wrigglers that they are? The tail moves with whip-like movements back and forth to propel the sperm towards the egg. Some people use the terms sperm and semen interchangeably.
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