Ultimately, just one. In reality, fertilization is like a game of darts with bad eyesight. Sperm have some idea of where to go due to hormones excreted by the egg but due to the difficulty of the journey, most end...
Spermatozoa, after passage through the epididymis, are motile cells. Sperm motility becomes critical at the time of fertilization because it allows or at least facilitates passage of the sperm through the zona pellucida. Without technologic intervention, a non-motile or abnormally-motile sperm is not going to fertilize. Hence, assessing the fraction of a sperm population that is motile is perhaps the most widely-used measure of semen quality.
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