Fluctuating asymmetry, second to fourth finger length ratios and human sexual orientation

@article{Rahman2005FluctuatingAS,
  title={Fluctuating asymmetry, second to fourth finger length ratios and human sexual orientation},
  author={Qazi Rahman},
  journal={Psychoneuroendocrinology},
  year={2005},
  volume={30},
  pages={382-391}
}
  • Q. Rahman
  • Published 1 May 2005
  • Psychology, Biology
  • Psychoneuroendocrinology
View on Elsevier
isiarticles.com
80 Citations
Highly Influential Citations
6
Background Citations
36
Methods Citations
3
Results Citations
10

Tables from this paper

80 Citations

Sexual Orientation and Fluctuating Asymmetry in Men and Women
TLDR
Although elevated levels of developmental stress appear to be linked to shifts in sexual orientation, the underlying mechanism does not seem to be connected to sex-atypical prenatal hormones.
Hand Asymmetry in Heterosexual and Homosexual Men and Women: Relationship to 2D:4D Digit Ratios and Other Sexually Dimorphic Anatomical Traits
TLDR
The present evidence actually suggests that homosexuals have lower FA than heterosexuals, raising the question of whether the positive fitness components associated with low FA may contribute to selection that maintains homosexuality in a population.
Sexual Orientation, Sexual Arousal, and Finger Length Ratios in Women
TLDR
Women’s sexual and behavioral traits, and potential anatomical traits, are possibly masculinized at different stages of gestation, possibly due to their sex-atypical masculinization during prenatal development.
Prenatal Influences on Sexual Orientation: Digit Ratio (2D:4D) and Number of Older Siblings
Prenatal androgen levels are suggested to influence sexual orientation in both sexes. The 2D:4D digit ratio has been found to associate with sexual orientation, but published findings have often been…
Fraternal Birth Order, Handedness, and Sexual Orientation in a Chinese Population
TLDR
The results showed that homosexual women are more likely to be non-right-handed than heterosexual women, regardless of how sexual orientation was defined, whereas bisexual women areMore likely to been non- right-handedthan heterosexual women whenSexual orientation was assessed via sexual attraction and sexual identity.
Finger Length Ratio (2D:4D) and Dimensions of Sexual Orientation
TLDR
A continuous neurohormonal sexual differentiation of the brain, most notably for women, that overrides categories and results in varying dimensions of sexual orientation is hypothesized.
Shape Differences Between the Faces of Homosexual and Heterosexual Men
TLDR
Differences in facial morphology of homosexual and heterosexual men do not simply mirror variation in femininity, and the stereotypic association of feminine looking men as homosexual may confound judgments of sexual orientation.
Hair whorl direction and sexual orientation in human males.
TLDR
The authors found no significant difference between heterosexual and homosexual men in hair whorl direction, but the authors did replicate the fraternal birth order effect (more older brothers for homosexual men).
Handedness is a biomarker of variation in anal sex role behavior and Recalled Childhood Gender Nonconformity among gay men
TLDR
It is suggested that developmental processes linked to handedness underpin variation among men in sexual orientation and gender nonconformity as well as variation among subgroups of gay men that are delineated by anal sex roles.
Fraternal Birth Order and Extreme Right-Handedness as Predictors of Sexual Orientation and Gender Nonconformity in Men
TLDR
There was evidence for a relationship among handedness, sexual orientation, and CGN, and mediation analysis revealed that handedness was associated with sexual orientation directly and also indirectly through the mediating factor of CGN.
...
...

References

SHOWING 1-10 OF 68 REFERENCES
Sexual orientation and the 2nd to 4th finger length ratio: evidence for organising effects of sex hormones or developmental instability?
Neurohormonal functioning and sexual orientation: a theory of homosexuality-heterosexuality.
TLDR
Evidence indicating that the process of determining human sexual orientation is fundamentally the same in all mammals is reviewed, and a theory of how the entire spectrum of humanSexual orientation is determined is proposed.
Finger-length ratios and sexual orientation
TLDR
The androgen-sensitive pattern of finger lengths is examined, and there is evidence that homosexual women are exposed to more prenatal androgen than heterosexual women are, and men with more than one older brother, who are more likely than first-born males to be homosexual in adulthood, are exposure to more pregnancies than eldest sons.
The ratio of 2nd to 4th digit length and male homosexuality.
  • Robinson, Manning
  • Psychology, Medicine
    Evolution and human behavior : official journal of the Human Behavior and Evolution Society
  • 2000
Born gay? The psychobiology of human sexual orientation
Sex hormones and finger length: What does 2D:4D indicate?
Are 2D:4D finger-length ratios related to sexual orientation? Yes for men, no for women.
  • R. Lippa
  • Psychology, Medicine
    Journal of personality and social psychology
  • 2003
TLDR
Findings add to evidence that prenatal hormonal factors may be linked to men's sexual orientation as well as ethnic groups, after ethnicity was taken into account.
Sexual orientation and performance on sexually dimorphic motor tasks
TLDR
Heterosexual men outperformed heterosexual women, whereas gay men threw less accurately and lesbians tended to throw more accurately than their heterosexual counterparts, suggests that both sexual orientation and motor/cognitive predispositions may have early biological contributions.
Large sexual-orientation-related differences in performance on mental rotation and judgment of line orientation tasks.
TLDR
Large differences between the male groups in favor of heterosexual men on JLO and MR performance revealed possible variations in the parietal cortex between homosexual and heterosexual persons.
The Relation Between Sexual Orientation and Penile Size
TLDR
On all five measures of penile length and circumference, homosexual men reported larger penises thandid heterosexual men, and Explanations for these differences are discussed.
...
...