Who is allowed to touch whom, where, and under what circumstances? Thanks to a cross-cultural study, we now know:
The greater the pleasure caused by touching a specific area of the body, the more selectively we allow others to touch it.
Few major differences were seen in the types of social touching allowed between the different cultures.
The closer the relationship, the fewer places were off-limits.
The study was published in the journal PNAS (Suvilehto et al., 2015).