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People also require sperm analysis to check the success of a vasectomy. Some of these are:. Abnormally sized or shaped sperm can have difficulty reaching, penetrating, and fertilizing the egg. Our partners OpenLearn works with other organisations by providing free courses and resources that support our mission of opening up educational opportunities to more people in more places. Just to think about it makes me feel guilty, because a rough calculation shows that I've disappointed about 7,,,, of the little fellas. That means a fertile man may produce between 40 million and million sperm cells in total, though the majority produce between 40 and 60 million sperm cells per millilitre, giving an average total of 80 to million sperm per ejaculation.