Chapter 12: Sexual Orientation and the Evolution of Homosexuality
12.0 Introduction
12.1 Chapter objectives
12.2 What do we mean by “Sexual Orientation?”
12.3 Sexual preference is not binary
12.4 Homosexuality is widespread in nature
12.5 Proximate causes: Is sexual orientation genetic?
12.6 Proximate environmental causes Part 1: Is sexual orientation influenced by the environment?
12.7 Proximate environmental causes Part 2: Fraternal birth order and the uterine environment
12.8 Ultimate causes: Why is homosexuality an evolutionary “puzzle?”
12.9 How did homosexuality evolve?
12.10 Testing some of the hypotheses about the evolution and occurrence of homosexuality
12.11 Understanding homophobia
12.12 Wrapping up: And tango makes three
