The main goal of this course is to help students understand the nature of science and how to evaluate the quality of science. Our focus is evolutionary biology, and specifically its role in helping us understand the biology of sex. We provide a review of basic biology (DNA, genetics, etc.) and build on that to examine the role of sex (or sometimes lack of sex) in the lives of a wide scope of diverse organisms. An evolutionary perspective helps us understand some of the psychological and sociological aspects of sexual behavior in humans. We examine a number of facts and fallacies about sex, including aspects of human sexual biology. The focus will be on contemporary issues in sexual biology.