Authors whose work on sex Posner discusses include Sigmund Freud, the founder of psychoanalysis, the biologist Alfred Kinsey, and the philosopher Michel Foucault. He writes that Kinsey was "picked by the university authorities to head up the newly created Institute for Sex Research" and that "when their limitations are understood and respected" the Kinsey Reports "are a vast mine of useful information, have been repeatedly corroborated by other studies, and appear to be generally accurate, at least for the sample interviewed, because of the extraordinary lengths to which the interviewers went to elicit truthful answers." According to Posner, sociobiology has "advanced striking hypotheses concerning aspects of human sexuality such as courting, the double standard, polygamy, and homosexual preference." He refers to the anthropologist Donald Symons's The Evolution of Human Sexuality (1979) as the "best single book on the sociobiology of sex".
