The Descent of Man, and Selection in Relation to Sex is a book by Charles Darwin which applies evolutionary theory to human evolution, and details his theory of sexual selection, a form of biological adaptation distinct from, yet interconnected with, natural selection. The book discusses many related issues, including evolutionary psychology, evolutionary ethics, differences between human races, differences between sexes, the dominant role of women in mate choice, and the relevance of the evolutionary theory to society.

Charles Darwin (1809-1882) was an English naturalist, geologist and biologist, best known for his contributions to the science of evolution. His proposition that all species of life have descended over time from common ancestors is now widely accepted, and considered a foundational concept in science.Darwin published his theory of evolution with compelling evidence in his 1859 book On the Origin of Species. He has been described as one of the most influential figures in human history.