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The median AGD length is about 2 inches; men with a shorter measurement stand a seven-times greater risk of having fertility problems as opposed to men with a longer AGD. They are more likely to be sub-fertile, which generally indicates a sperm count of less than 20 million per milliliter. Men with sperm counts in this range are only half as likely to succeed in getting a partner pregnant as men with more typical sperm counts in the range of 50 to 60 million sperm per milliliter.