That old scientific link between your finger length and who you're into? It pretty much disappears once you clear out the biased data.
PsyArXiv · March 18, 2026 · 3dcth_v3
The Takeaway
For years, the '2D:4D ratio' (the difference in length between your index and ring fingers) was cited as a biological marker for prenatal hormone exposure and sexuality. This re-analysis suggests that the effect was mostly an illusion created because researchers were only publishing studies that found a link while burying those that didn't.
From the abstract
The ratio between the lengths of the second and fourth digits (2D:4D) has been proposed as a putative marker of prenatal androgen exposure and investigated for its potential link to sexual orientation. In a recent updated meta-analysis, Swift-Gallant et al. (2025) reported more male-typical digit ratios in same-sex-oriented women than in heterosexual women, while homosexual men showed more female-typical ratios than heterosexual men. Their analyses found no evidence of publication bias for femal