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Sperm are constantly in danger. Once mature, sperm are stored in a long tube called the epididymis where they wait to be ejaculated. Vaginal walls tend to be acidic to protect women from potential infections.
In the types of sexual reproduction known as anisogamy and its subtype oogamy , there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell.