  Of more interest for a consideration of science and philosophy are a group of analogies in medical and philosophical texts between yin and yang and male and female. They describe the conditions of men and women by analogy with yin and yang, heaven and earth, and sometimes right and left. For example, the statement that women and men have opposite pulse patterns: “In women the right [pulse] manifests opposition, the left manifests obedience; in men the left [pulse] manifests opposition, the right manifests obedience” (Huang Di neijing suwen, 15.2.45).