However, what we call beauty may also be nature giving priority to health when choosing a mate. Scientists have looked at how people assess female beauty and have found similar things among different societies. In one investigation, researchers looked at the waist-to-hip ratie: the size of the waist in comparison with the size of the hips They found that the ideal ratio is virtually the same across cultures. The ideal for women of 0.70:1 is not only a sign of beauty; it also predicts good health and easy childbirth. Obviously then, nature and evolution play a part in our idea of beauty.