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The testicles of adult men produce about half a billion sperm each day. By contrast, a woman's ovaries are stimulated to grow only a few eggs each month. Usually, only one of these eggs reaches maturity and is able to be fertilized. Fertilization can only occur during ovulation; the time in a woman's monthly cycle where the mature egg is released from the ovary and travels through the fallopian tube. For conception to occur, one ... more