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The minimum number of viable sperm per ejaculation to be considered fertile is 20 million, with at least 50 percent showing forward mobility under a microscope (presumably they take an action shot for this?) The number per normal adult male ejaculation is 90 to 160 million, with the upper probable limit (4 standard deviations) falling at roughly 400 million. Forward mobility of 50% is once again considered normal and no more than 10% should show signs of cellular damage or underdevelopment.
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