Biological Research on Women's Sexual Orientations: Evaluating the Scientific Evidence

The importance of biological influences on sexual orientation is hotly debated. This article summarizes public opinions about the causes of sexual orientations and documents shifts over time toward greater endorsement of biological rather than environmental explanations. Next, empirical evidence concerning neuroendocrine and genetic explanations of women's sexual orientation is reviewed. Currently, there is no convincing evidence that biological factors are a determining influence on women's sexual orientations. In some research areas, the data on women are incomplete. In areas where adequate research is available, studies on women do not conclusively support biological hypotheses. Implications of these findings are considered.