Ovulation Calculator The Shettles Method: If you want a boy, on the other hand, you should have sex as close as possible to ovulation — since the speedy Y-sperm will be more likely to get to the egg first. So to conceive a boy, you should have sex four to six days before ovulation. And to conceive a girl, you should have sex either two to three days before ovulation or on the day of ovulation. There are a variety of kits available that are based on altering the conditions around the egg and sperm by using nutritional supplements and douches to make the vaginal tract more receptive to either the X- or Y-sperm.
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The Bayesian analysis generalizes easily to the case in which we relax the If we have no information about the populations then we assume a "flat prior", i. Martingale analysis[ edit ] Suppose you had wagered that Mr Smith had two boys, and received fair odds. We think of your wager as investment that will increase in value as good news arrives. What evidence would make you happier about your investment?