Read the study from Evolution and Human Behavior.
Read the UCLA study here.
Read about it more HERE.
Read about is on Bloomberg.
Read the study on the Journal of Sex Research.
Read the study from the American Anthropologist.
Read the study from the Journal of Sexual Medicine.
Read the study from the International Journal of Sexual Health.
Read the study from the Journal of Sexual Medicine.
Read the study from PLOS One.
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