Hence a fertilized embryo, viewed simply as an early-stage construction project, represents an utterly trivial investment of its father's body mass compared to its mother's. But, that doesn't mean the female has automatically lost the game of chicken before the moment of conception. Along with the one sperm that fertilized the egg, the male may have produced several hundred million other sperms in the ejaculation, so that his total investment may be not dissimilar to the female. According to the passage, why has the female not automatically lost the game of chicken before the moment of conception?