This works for a variety of different reasons, but is based in the fact that the two kinds of chromosomes that are responsible for gender selection are carried by sperm that are very different. The Y chromosome is responsible for conceiving a boy. The sperm that carry this chromosome are small, quick and able to cover the distance to the egg very rapidly. The downside is they don't live very long and if they have to swim too far, they won't be able to complete their journey successfully.
The X chromosome sperm are responsible for conceiving a girl. These sperm are much larger, and move quite a bit slower. However, they live a lot longer and have more endurance when it comes to reaching the egg.
Here's what you need to know when it comes to picking positions to pick gender.
How to Have a Boy
Because the Y sperm need a little extra help in reaching their destination before they expire, positions that allow deep penetration are essential. The goal is to have the man orgasm as closely as possible to the neck of the cervix. This reduces the amount of time that the sperm will need to spend getting to the egg.
Positions that allow for this to occur include woman dominant, or woman on top as well as its other variation, commonly called Reverse Cowgirl. In these positions, the woman is astride the man and can control how deeply he penetrates her. At the moment of orgasm, the woman should allow the man inside as deeply as possible.
There are a few other positions as well, but the important thing to remember is that the deeper the penetration at the moment of orgasm, the more likely you are to have a boy.
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How to Have a Girl
If you would prefer to have a girl, the proper positions involve much shallower penetration. The X sperm are much more durable and need a little more time to reach the egg, allowing the Y sperm to die off before they get there. This means that the man should orgasm as far away from the neck of the cervix as possible.
Positions for shallow penetration include missionary, spooning and the lotus position where the couple wrap their legs around each other while sitting. The positions do not allow for deep penetration and the desired result of increasing the likelihood of having a girl can be achieved.
Don't Forget
There is one more thing to remember when choosing a position for choosing gender. If you do want to have a boy, it is important that the woman orgasm before the man. This changes the PH near the cervix, making it more hospitable to the Y sperm. The opposite is true if you want to have a girl.
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