The egg is an amazing gamete or cell because it is passed from mother to daughter and is affected by the lifestyle of the human being carrying it. It's passiveness is a key element to its protection against degrading. While hundreds of other eggs slowly die away the surviving eggs are genetically superior to those who have been damaged. The millions of sperm which attach to the egg all aid in weakening its outer membrane and without the effort of all one could not break through the guard cells of the egg. Sperm are only able to break through the strong egg due to efforts of hundreds. So while an egg has a long arduous trial to produce a child sperm are a dime a dozen.
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