Evolutionary theory suggests that women are more likely to fantasize about familiar partners because female reproductive success in ancestral times was dependant on protective relationships with reliable partners.

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According to the theory of parental investment, women have a higher investment in reproduction due to the greater physical cost of pregnancy and lactation. Therefore, in ancestral times, women were more likely to seek out protective relationships with reliable partners to ensure the survival of their offspring, leading to a preference for familiar partners in their sexual fantasies.

Evolutionary Theory Suggests That Women Are More Likely to Fantasize