Women seem to be able to recognize others in the most fertile phase of their menstrual cycle, simply by looking at their faces. Findings of a new study imply that more fertile women, who are likely to have more children in their lifetime, "are better at guarding their mate from potential adultery."

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Women seem to be able to recognize others in the most fertile phase of their menstrual cycle, simply by looking at their faces. Findings of a new study imply that more fertile women, who are likely to have more children in their lifetime, "are better at guarding their mate from potential adultery."