A Natural History of Rape: Biological Bases of Sexual Coercion is a 2000 book about rape by biologist Randy Thornhill and anthropologist Craig T. Palmer, in which they propose that rape should be understood through evolutionary psychology, and criticize the argument, popularized by Susan Brownmiller in Against Our Will, that rape is not sexually motivated. Thornhill and Palmer argue that the capacity for rape is either an adaptation or a byproduct of adaptative traits such as sexual desire and aggressiveness. The book received extensive criticism.