(Comic I made three years ago. Ignore the twitter logo)
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Serious answer: eggs have a protective barrier around them, so sperm actually need to group in bunches to break the barrier, and a single lone sperm is incredibly unlikely to do well on its own. As such the ones that have a higher chance of success are actually the ones that are last and get in after the barrier’s been weakened.
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There’s also evidence that eggs ‘choose’ the sperm, or at least filter out some sperm based on genetic factors.
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