Final answer:
According to evolutionary psychologists, men prefer women whose waists are 30% narrower than their hips because it indicates peak sexual fertility.
Step-by-step explanation:
According to evolutionary psychologists, men prefer women whose waists are 30% narrower than their hips because it indicates peak sexual fertility. Research suggests that some universally attractive features in women include a lower waist-to-hip ratio. Females with a wider pubic angle and larger diameter pelvic canal have historically reproduced more successfully, enabling successful childbirth.