For Safe Motherhood wanted children should be of desired sex. As Y sperm have a shorter life span and migrate faster, if coitus occurs before ovulation, sperm must wait in the tube for the ovum to arrive. By the time the ovum arrives, Y sperm have died and X sperm fertilize the ovum, resulting in a baby girl. If coitus takes place after ovulation when the ovum is waiting in the tube, the faster migrating Y sperm fertilize the ovum resulting in a baby boy. Eighty women wishing to test this hypothesis by basal body temperature and ultrasound were recruited. Correct results have so far been obtained in 97%. This theory can be used for Safe Motherhood, for population control and to eliminate sex-linked genetic disorders. It can also prevent both female feticide and infanticide in some cultures.
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