Men find low waist-to-hip ratios attractive, commonly referred to as an hourglass figure, because it signals youth - not health or fertility - and is a reliable signal of physical and sexual maturity in young women who have not been pregnant, suggests a new study of over 12,000 female participants.

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Men find low waist-to-hip ratios attractive, commonly referred to as an hourglass figure, because it signals youth - not health or fertility - and is a reliable signal of physical and sexual maturity in young women who have not been pregnant, suggests a new study of over 12,000 female participants.