The Fertile Crescent (also known as the "cradle of civilization") is a crescent-shaped region where agriculture and early human civilizations like the Sumer and Ancient Egypt flourished due to inundations from the surrounding Nile, Euphrates and Tigris rivers.
The would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
