Final answer:
Sexual signals during estrus in female primates serve the purpose of attracting males for mating and increasing the chances of successful reproduction.
Step-by-step explanation:
Sexual signals during estrus in female primates serve the purpose of attracting males for mating and increasing the chances of successful reproduction. These signals can be visual, chemical, auditory, or tactile in nature, depending on the species. By displaying sexual signals during estrus, female primates communicate their readiness to mate and optimize their chances of reproductive success.