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Medically, there are no proven methods in which the relationship between type of sexual position and gender of the baby are related. Folklore does recommend missionary position for a girl and woman with pillow under the hips and legs at the side for a boy. One theory is that sperm that carry the male chromosome are tiny and fragile but very quick, whereas the female sperm are larger and hardier, but rather sluggish. Those that adhere to this theory claim that you can improve your chances of conceiving a boy, for example, by timing intercourse one single time as close to ovulation as possible, then not again during the same cycle. The reasoning behind this being that the male sperm would race to their reward much faster than the female sperm. In addition, this will assure that the male sperm have as much access to the cervix
as possible. Penetration should be deep at the moment of ejaculation in order to give the males a headstart, while the larger female sperm move slower.