(Same as Communication M72A, Clusters M72A, and Sociology M72A.) Lecture, three hours; discussion, two hours. Course M72A is enforced requisite to M72B, which is enforced requisite to M72CW. Limited to first-year freshmen. Examination of many ways in which sex and sexual identity shape and are shaped by biological and social forces, approached from complementary perspectives of anthropology, biology, medicine, and sociology. Specific topics include biological origins of sex differences, intersex, gender identity, gender inequality, homosexuality, sex differences, sex/gender and law, and politics of sex research. Letter grading.