I usually wouldn't worry too much about replying like this, but I really would like all women who would like to attempt to sway to be fully informed. All the most recent research actually debunks Shettles. X and Y sperm live the same amount of time and will usually swim at the same speed. However there is plenty of research that show there are certain factors that will favour one sperm over the other, eg. female testosterone, pH and even a full moon.
If I were to give any advise to couples wanting to sway the odds I would simply say do lots of research and don't put all your trust in timing alone.
Apparantly position helps too, for a boy you need a deeper penetration (not sure how detailed I can get here LOL) and orgasming aids boy sperm so if you want a girl missionary and you don't oragsm works better.
We tried quite a number of the things with DS to get a boy and we did! DH wouldn't come at sponging his bits with a cold sponge though!!
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