We investigated the relationship between patterns of sex and hand differences in circadian wrist activity and digit ratio, a marker for prenatal androgen exposure. If the contribution of prenatal androgen exposure to sex differences in digit ratio underlies sex differences in circadian wrist activity, we predict that patterns of wrist activity will be correlated with digit ratio. Bilateral wrist activity of male and female college students was measured for three consecutive days. Digit ratio was obtained from photocopy measurements of the second and fourth fingers of each subject. Males had lower digit ratios with more pronounced differences on the right hand. Female acrophase occurred earlier than male acrophase.
Chubby hands or little fingers: sex differences in hand representation
Sex Hand Gesture Icons - Download Free Vector Icons | Noun Project
The midsagittal area of the corpus callosum was measured in its entirety and in seven subdivisions in a sample of 50 brains consecutively obtained from autopsies of individuals who had neuropsychological testing before death. A item test of hand preference was used as an index of the pattern of interhemispheric functional asymmetry. Callosal size was analysed for two factors: hand preference, classified as consistent-right-hand preference CRH versus non consistent-right-hand preference, and sex. The results of variation in callosal morphology are discussed as part of a possible substrate of functional asymmetry and due to variation in axonal elimination in early brain development. Sex differences were found in several aspects of callosal anatomy.
Shocker (hand gesture)
Performed the experiments: JG. Analyzed the data: JG. Sex perceptions, or more particularly, sex discriminations and sex categorisations, are high-value social behaviours.
The shocker , also known colloquially as "two in the pink, one in the stink,"   is a hand gesture with a sexual connotation. The index and middle fingers are kept together touching and the back of the hand faces outwards away from the gesturer. The gesture refers to the act of inserting the index and middle fingers into a vagina and the little finger into the recipient's anus , hence the "shock". From Wikipedia, the free encyclopedia.