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Ideals of sexiness are universal, contrary to arguments that media images are to blame. Most advertisements feature people with perfectly symmetrical faces, as this is a sign of phenotypic quality—or good genes. A deep male voice is inherently attractive, as it indicates greater exposure to pubertal testosterone and is linked to reproductive fitness. Even in cultures without access to mass media, the optimum waist-to-hip ratio for women is around 0.7, which corresponds most closely to an hourglass shape, and is linked to fertility. In addition, women often send subtle (and subconscious) come-hither cues at the most fertile time of the month.
Mr Saad has delivered a light round-up of the latest studies in evolutionary behavioural science. But he does not limit his observations to sex-specific characteristics. He also includes notes on how people handle food, family, friendship and social hierarchies. Gift-giving between friends, for example, strengthens non-kin bonds as people choose friends who can reciprocate. And an adaptation called the “variety effect” makes it nearly impossible to not overeat at a buffet, as a wider choice of dishes leads to a higher calorie intake—in order to maximise nutrient sources and minimise the toxins from a single food source. Parents tend to be more protective of their daughters than their sons because the familial costs of pregnancy are higher. As for concerns over paternity, fathers instinctively provide the greatest investment in children who look like them, and maternal grandmothers (the lone grandparent who has no paternal uncertainty) tend to be the most involved.

A. 어휘
Ideals 理想(이상). universal 보편적인. contrary to ...에 반대로.
arguments 주장. are to blame 꾸중을 들어야한다.
feature 두드러지게 하다, 크게 다루다. symmetrical 균형 잡힌.
phenotypic 표현형(유전자와 환경의 영향에 의해 형성된 생물의 형질).
inherently 선천적으로. exposure 노출. pubertal 사춘기의, 춘기발동기의.
reproductive 생식의. access 접근. optimum 최적조건.
ratio 비율. corresponds 해당하다, 대응하다. hourglass 모래시계.
fertility 多産(다산), 出産力(출산력). subtle 미묘한. subconscious 잠재의식적인.
come-hither 性的(성적)으로 도발적인, 유혹적인.
fertile 受胎(수태)가능한, 임신하기 좋은, 多産(다산)의. round-up 槪括(개괄).
evolutionary behavioural science 진화행동과학.
sex-specific 성에 特有(특유)한. characteristics 특징. hierarchies 계급, 체계.
kin 친척. reciprocate 주고받다, 교환하다. adaptation 적응.
nutrient 영양이 되는, 영양소. toxins 毒素(독소). pregnancy 姙娠(임신).
paternity 아버지임, 부자관계. maternal grandmothers 외할머니.
paternal uncertainty 親子(친자)여부에 대한 불확실성.