From an evolutionary perspective,

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According to evolutionary theory, women's reproductive output is limited by the number of pregnancies they can have, while men's reproductive output is limited by the number of females they can successfully mate with. Therefore, women have to be more selective with respect to their mating partners to ensure that their offspring receive the best possible genes and resources to survive and reproduce. This does not necessarily mean that women are less promiscuous than men, but rather that they are more selective in their choice of partners. Additionally, men's reproductive success is enhanced by mating with the fittest females (i.e., those who are most likely to produce healthy offspring), but this does not necessarily mean that women's reproductive success is related to the number of male partners.

From an Evolutionary Perspective