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Shettles Method which is based on the premise that sperm carrying the X and Y chromosomes have different characteristics and that you can influence the reproductive environment to favor one or the other. Here's how the theory goes:

It is the sperm that fertilizes the egg that will determine the sex of the baby. Some sperm carry the X-chromosome and some sperm carry the Y-chromosome. If an X-chromosome-carrying sperm fertilizes the egg, the baby will be a girl. If a Y-chromosome-carrying sperm fertilizes the egg, the baby will be a boy.

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The Y-chromosome-carrying sperm are said to:

  • be faster and smaller than the X-chromosome carrying sperm.

  • die faster than the X-chromosome-carrying sperm.


  • The X-chromosome-carrying sperm are said to:
  • be slower than the Y-chromosome carrying sperm.

  • be better able to withstand the acidic cervical environment before fertile cervical fluid is produced.


  • Based on these premises, you can time intercourse, choose a sexual position that favors conception of your preferred sex and influence the reproductive environment to increase the likelihood of conceiving your preferred sex. These are the suggestions from Dr. Shettles:

      To Get A Boy (According to Shettles):
    • Time intercourse as close to ovulation as possible: The idea is that since the Y-chromosome sperm are faster than the X-chromosome sperm, there will be more Y-chromosome sperm who reach the egg, making it more likely that a Y-chromosome carrying sperm will fertilize the egg.
    • Abstain from intercourse for four to five days prior to ovulation. Have intercourse only just at the time of ovulation and just before.
    • Have intercourse that allows for deep penetration. Shettles recommends rear-entry (aka, "doggy-style"). The idea is that the sperm will be deposited closer to the cervix where cervical fluid is most friendly to the Y-chromosome sperm and where the “boy sperm” are more likely to survive since there is less distance to travel.
    • Men avoid tight clothes: heat kills off both types of sperm, but will kill off the less protected, smaller Y-chromosome sperm faster, according to Shettles.
    • Women have an orgasm: According to Shettles, female orgasm increases the alkaline secretions in the vagina that are favorable to the Y-chromosome carrying sperm. Shettles recommends having an orgasm before or at the same time as the male partner.

      To Get a Girl (According to Shettles):
    • Have intercourse 2-3 days before ovulation and avoid intercourse just before ovulation until 2 days after ovulation and when you have peak cervical fluid: The idea is that when you have sex a few days before ovulation, only the X-chromosome "girl sperm" will be left in the female reproductive tract waiting to fertilize the egg when it is released.
    • Have intercourse with shallow penetration: Shettles recommends "missionary position" or any position that will deposit the sperm slightly away from the cervix, giving advantage to the longer living, but slower X-chromosome-carrying sperm.
    • Women avoid orgasm: Shettles suggests women avoid orgasm because it makes the vaginal environment more alkaline, and less acidic and is disadvantageous to the X-chromosome "girl sperm".



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    4 PEOPLE COMMENTED:

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