This reminds me of when we learned about sex and pregnancy at school. Our science teacher told us that if we wanted to have a baby boy, it would be best to do the deed closer or when you ovulate.
If you wanted a girl, you could make love three days before because the girly sperm swims slower.
New Scientist's Bumpology writer sort of reinforces that point, however it had nothing to do with the sperm being faster or slower. Linda Geddes suggests this method as a natural way of selecting your child's gender:
For example, according to the Shettles method, having sex as close to the moment of ovulation as possible is supposed to skew the ratio towards boys: the Y chromosome is smaller, so the reasoning is that Y-carrying sperm swim faster and are first to reach the egg. Meanwhile, shallow penetration is supposed to boost your chances of having a girl, because according to Shettles X-carrying sperm are more robust, and therefore survive longer in the harsh vaginal environment.
Unfortunately, only my science teacher and Shettles believe this theory.
"There's no evidence that male and female sperm swim differently, and there's no evidence that they survive differently," says Allan Pacey, a lecturer in male health at the University of Sheffield, UK.
Geddes goes on to address other methods of conceiving a child with the gender of your choice here.
As most doctors will tell you, the common causes of back pain can range from the simple to the complex. But did you know back pain is an actual symptom rather than a diagnosis? That means anything could have caused that pain in your back. In fact, some of the causes might have nothing to do with your back at all, as this list below from manofthehouse.com explains: Read more
One in every six couples in the world, and one in every four couples in developing countries, was found to be suffering from infertility—according to a WHO study, published at the end of 2012. Read more
When it comes to hair extensions, new hairstyles, and wigs, the Brazilian hair has attained a new definition and special status. The Brazilian hair has gained prominence in the recent years, thanks to its comfortable and form-fitting nature enough for decorative purposes. Read more