" In the human mating dance, the costs of being deceived about a potential mate's resources and commitment are carried more heavily by women. An ancestral woman who made a poor choice of a casual mate, allowing herself to be deceived about the man's long-term intentions, risked enduring pregnancy, childbirth, and child care unaided and being less able to attract an alternative mate, since existing children are seen as costs by potential mates on the mating market. Women guard against deception by requiring extended courtship. Men who seek to deceive women about their ultimate intentions typically tire of extended courtship. They go elsewhere for sex partners who are more readily available. "

― David M. Buss , The Evolution Of Desire: Strategies of Human Mating