Digit ratio (2D:4D) and male facial attractiveness: New data and a meta-analysis

From the book : Evolutionary Psychology 11 issue 5 : 944-952.
Digit ratio (2D:4D) appears to correlate negatively with prenatal testosterone (T) effects in humans.
As T probably increases facial masculinity, which in turn might be positively related to male facial attractiveness, a number of studies have looked into the relationship between 2D:4D and male facial attractiveness, showing equivocal results.
Here, I present the largest and third largest samples so far, which investigate the relationship between 2D:4D and male facial attractiveness in adolescents (n 115) and young men (n 80).
I then present random-effects meta-analyses of the available data (seven to eight samples, overall n 362 to 469).
These showed small (r ≈ -.09), statistically non-significant relationships between 2D:4D measures and male facial attractiveness.
Thus, 2D:4D studies offer no convincing evidence at present that prenatal T has a positive effect on male facial attractiveness.
However, a consideration of confidence intervals shows that, at present, a theoretically meaningful relationship between 2D:4D and male facial attractiveness cannot be ruled out either.