According to this study here, the topography of social touching depends on emotional bonds between humans. Well, we have suspected that but didn’t know it looks so cool when illustrated.
The blue-outlined black areas highlight the taboo zones, where a person with that relationship is not allowed to touch. The data are thresholded at P < 0.05, FDR-corrected. Color bar indicates the t statistic range. Blue and red labels signify male and female subjects, respectively.