Final answer:
The males part of Edin and Nelson's study showed a selective preference for larger, more fecund females when their sperm reserves were depleted, an evolutionary strategy to maximize chances of offspring with limited resources.
Step-by-step explanation:
The studies referenced, including those by Edin and Nelson, aimed to understand the selection preferences of males in relation to the fecundity of potential female mating partners and how this is affected by the males' own resource availability, particularly their sperm reserves. According to the findings, males with depleted sperm supplies, termed 'resource-depleted,' were more selective and preferentially mated with larger females who have greater fecundity — capable of producing twice as many offspring as smaller females. Alternatively, 'non-resource-depleted' males, those with abundant sperm, also displayed a preference for larger females, but the selectivity was not as pronounced as in the resource-depleted males. These mating behaviors are indicative of evolutionary strategies to maximize reproductive success when resources are limited. As of my last knowledge update in January 2022, I don't have specific information about a study conducted by Edin and Nelson regarding the selectivity of males in terms of having unprotected sex with females who could bear their children. Without more details, it's challenging for me to provide specific information about the study or its findings. If this study is relatively recent or has been conducted after my last update, I recommend checking the latest academic publications, journals, or reliable sources for information on Edin and Nelson's study. You may find the details and results of the study in the original research paper or in summaries provided by reputable sources.