Night owl women are similar to men in their relationship orientation, risk-taking propensities, and cortisol levels: Implications for the adaptive significance and evolution of eveningness.

Although NO males reported having had, on average, almost twice as many sexual partners as EM males (M ± SD = 11.00 ± 14.99 vs 6.36 ± 5.29), the difference between groups failed to reach statistical significance, t (54) = 1.30, ns.

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