Inconvenient truth about our evolution

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Watookal (December 06, 2010, 11:56:35 AM):
Quote
The gender of the fetus is determined by whether a sperm carrying the X-chromosome (resulting in female offspring) or the Y-chromosome (resulting in male offspring) fertilizes the ovum. The Y-sperm has higher motility at ejaculation, but loses it faster.* If the sperms have to wait for the ovum, the X-sperms will gain the upper hand. This is likely to be the case if the parents have frequent sex. If the parents only have sex after the ovum has already been released, the Y-sperm has the upper hand. This is more likely when the parents have infrequent sex. Couples who have frequent sex are therefore more likely to have daughters

I thought it was the time of month that decided. http://www.ovulation-calendar.net/ has a nifty "when to bonk" calendar. It ties in with your theory that the male sperm will swim fast and get the job done if there's an egg ready (if done just after ovulation) where the female sperm will linger longer and wait for an egg (if done a couple of days before ovulation)

Faerie (December 06, 2010, 12:05:02 PM):
Quote
The gender of the fetus is determined by whether a sperm carrying the X-chromosome (resulting in female offspring) or the Y-chromosome (resulting in male offspring) fertilizes the ovum. The Y-sperm has higher motility at ejaculation, but loses it faster.* If the sperms have to wait for the ovum, the X-sperms will gain the upper hand. This is likely to be the case if the parents have frequent sex. If the parents only have sex after the ovum has already been released, the Y-sperm has the upper hand. This is more likely when the parents have infrequent sex. Couples who have frequent sex are therefore more likely to have daughters

I thought it was the time of month that decided. http://www.ovulation-calendar.net/ has a nifty "when to bonk" calendar. It ties in with your theory that the male sperm will swim fast and get the job done if there's an egg ready (if done just after ovulation) where the female sperm will linger longer and wait for an egg (if done a couple of days before ovulation)


Got an uncle & aunt who followed this "recipe" as they only wanted a boy, well they got their boy all right, just a pity that 30 odd years later he told them he's gay.... >:D

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