In 1975 Hrdy was awarded her PhD for her research on langurs. In 1977 it was published in her second book, "The Langurs of Abu: Female and Male Strategies of Reproduction". The controversy in the anthropology realm that her research sparked was not surprising—the classic belief that primates act for the good of the group was discarded, and the field of sociobiology gained increasing support. Many mistakenly assumed that she implied existence of an 'infanticidal gene' that could be conserved across primates. Today, her results and conclusions are widely accepted. Even Trivers, who once dismissed her convictions, admits that her theory regarding female sexual strategies has "worn well."