After all, without sperm, the world would be a very lonely place. The rest swim around in circles or bob along with the motion of the semen. But because so many start their journey, plenty make it to the egg. Men produce sperm all day, every day - throughout their lives. But just like an assembly line, it takes time to go from the start to the end. Of course, what sperm lack in size they more than make up in sheer numbers. But there's one exception: the Y chromosome has no counterpart within the egg's DNA, so it's passed along essentially unchanged from father to son. A man's body keeps the ideal testicle temperature with radiator-like veins that pull heat away and muscles in the scrotum that raise and lower the testicles to bring them closer to the body's warmth - or farther away. He has fathered five children since then, three from banked sperm, but two, he says, were concieved naturally.
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