| The first part of the dissertation reviews evidence for the validity of relative finger lengths, such as the ratio of the index to ring finger, as markers for perinatal masculinization, which proceeds from the production of testosterone in the testes of males. Research conducted for the dissertation shows that sex differences in these finger length ratios arise prior to puberty and, as such, are probably associated with perinatal testosterone production within and between sexes. The second part reviews research testing for a relationship between finger length ratios and human sexual orientation and gender role identification. Additional studies were conducted using more refined methods of assessing sexual preferences and gender role. In sum, there remains no strong evidence for effects of perinatal (or adult) hormones on adults sexual orientation or gender role. |
