Second to fourth digit ratio (2D:4D), tomboyism, and temperament

This study examines the relationship between 2D:4D, a proxy for levels of prenatal testosterone, and rating oneself as a “tomboy” as well as the relationship between Fisher's hormone-based temperament factors and tomboyism. Salmon (2015) reported a relationship between female erotic fiction preferences and lower 2D:4D ratios in addition to a link between tomboyism and such preferences. The results of the current study indicate that lower 2D:4D ratios are associated with increasing tomboy scores and that tomboyism is associated with higher scores on the testosterone component of Fisher's temperament model as well as a marginal negative association with the estrogen/oxytocin factor. This lends support to Fisher's model as well as documenting the relationship between 2D:4D and tomboyism in a non-clinical population.