Japan invented the word skinship, and Korea's usage put it in the Oxford dictionary
Touch says things words cannot. A hug can trigger oxytocin and cut stress hormones, babies meet the world mainly through their skin, and primates spend up to a fifth of their day grooming each other. Even a long, steady gaze counts as physical intimacy, no contact required.
Physical intimacy covers any sensuous closeness, from holding hands and cuddling to sex, and it happens mostly between people who already share a family, friendly or romantic bond. Researchers find that affectionate touch tracks closely with how satisfied partners feel in a relationship. Proximity is the key ingredient, which is why sustained eye contact, or deliberately stepping into someone's personal space, is treated as a form of it. The flip side is discomfort when strangers crowd in uninvited, as on packed trains, where people tend to avoid each other's eyes.
Touch starts before birth, when a fetus senses the wall of the womb; skin is the body's largest sense organ and the first to develop. With limited sight and hearing, infants learn about temperature and texture by being held and fed. Babies deprived of affectionate handling, such as those in institutions, show cognitive and developmental delays that can last for years. Studies of premature infants found lower levels of the stress hormone cortisol after being held by their mothers, and the mothers' levels dropped too. In adults, massage and cuddling are linked with less pain, anxiety and low mood, and with better blood pressure.
Cultural norms vary widely. Societies nearer the equator, around the Mediterranean and in Latin America, tend towards high-contact habits, while northern Europe, North America and northeast Asia are lower contact, and some observational data link more touching cultures with less youth violence, though the field is understudied. Japan coined skinship, a pseudo-English word for closeness between mother and child, promoted by the paediatrician Nobuyoshi Hirai and first recorded in a major Japanese dictionary in 1971. It spread to South Korea and entered the Oxford English Dictionary in 2021.
Among primates, grooming goes far beyond hygiene. Some species groom partners much more than themselves, often keeping the same partners for years, and animals that groom each other more are likelier to defend one another when attacked. One interpretation is that grooming builds the trust that makes later support possible.
Source: Physical intimacy
