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The head contains all of the DNA or genetic material, and the sperm uses the tail to help it move.

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However, as they are not so fast as the Y chromosome sperm, they might not win the race, if you have sex closer to ovulation.

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The withdrawal method, or when the male "pulls out" of the female before ejaculation, is notoriously unreliable.

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As frequent sex can reduce the number of Y sperm present at each ejaculation, some women believe that more regular sex will help them get pregnant with a girl.

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Perhaps the most high profile studypublished by American epidemiologist Allen Wilcox, found no evidence to suggest that the timing of sex around ovulation led to a significant change in the sex ratio of resulting babies.

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Still, if you want to give trying for a boy or a girl a go with the ideas above, good luck, and let us know how your pregnancy turns out!

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Precisely how long they can survive depends on the environment that they are released into and how quickly the fluid surrounding the sperm cells dries up.

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The withdrawal method, or when the male "pulls out" of the female before ejaculation, is notoriously unreliable.

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Contradicting this, other research finds that extreme stress can lead to more female births.

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