Volume of semen varies from 1.5 to 5.0 millilitres per ejaculation. Median is 3.5 millilitres. Sperm count per millilitre varies from 20 million to 150 million. Median is 85 million per millilitre. That is 297.5 million sperm per ejaculation. 60% of the sperm should have normal shape and normal forward movement. So 178.5 million sperm can impregnate a woman. If I came 400 times over my lifetime, I have prevented around 71.4 trillion people from being born. (If there were enough wome
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