Trivors developed Batemans principle further and suggested that the entire investment made by a parent including gestation, protection and feeding are taken into account and not just their gametes. They suggest that the sex who invests the most in the offspring can afford to be the choosiest, as they have the greatest burden. The ‘cost’ of an egg doesn’t stop after production, the women has devote a lot of time after birth ensuring the protection etc. of the child, human babies are born with a much lower maturity than most animals due to the skull size which means that they are unable to physically survive without care. Females must make a larger investment to ensure existence. In addition to this, women’s fertility declines rapidly after thirty years meaning that a women can only have an average of 12 children whilst a man can mate freely for the majority of his life. This is why women are the choosier sex.
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