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Originally Posted by perspective 
What does "shettled" mean?
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A Dr. Shettles found that timing of when you bd can greatly effect the gender you get. For a girl you bd up to 3-5 days before O preferebly farther out. For a boy you get as close to O as possible.
The reason for this is that the sperm that are "female" have a longer life but swim slower than the "male" sperm. So the "female" sperm will sit and wait on the egg and beat any males to it. While the closer to O you are the higher the odds are the male sperm will get there first.
If done correctly the odds of getting your chosen gender is over 95% but it is easy to mess up if you are not really watching your fertile signs. Timing for a boy is easier than a girl if you know when you are oing.