
Physical intimacy issensuousproximity or touching. It is an act or reaction, such as an expression offeelings (including closefriendship,platonic love,romantic love, orsexual attraction), between people. Examples of physical intimacy includeholding hands,hugging,kissing, caressing andsexual activity.[1] Physical intimacy can often convey the real meaning or intention of an interaction in a way that accompanying speech cannot do. Physical intimacy can be exchanged between any people but as it is often used to communicate positive and intimate feelings, it most often occurs in people who have a preexistingrelationship, whether familial, platonic or romantic, with romantic relationships having increased physical intimacy. Several forms of romantic touch have been noted including holding hands, hugging, kissing, cuddling, as well as caressing and massaging. Physical affection is highly correlated with overall relationship and partner satisfaction.[2]
It is possible to be physically intimate with someone without actually touching them; however, a certainproximity is necessary. For instance, a sustainedeye contact is considered a form of physical intimacy, analogous to touching. When a person enters someone else's personal space for the purpose of being intimate, it is physical intimacy, regardless of the lack of actual physical contact.
Some people partake in physical intimacy, which is a natural part of interpersonal relationships andhuman sexuality, and research has shown it has health benefits. A hug or touch can result in the release of the hormoneoxytocin and a reduction in stresshormones.[3] Massages, stroking and cuddling have furthermore shown that they have widespread beneficial effects on well-being. The most pronounced effects can be found for a reduction of pain as well as feelings of depression and anxiety. However, also blood pressure and momentary mood can be improved through physical touch.[4]
Due to the important role that language-based communication plays in humans, the role of touch is often downplayed; however, there is ample evidence that physical touch still plays an important role in everyday human relationships. While humans often communicate verbally, they also participate in close contact. Physical touch has emotional and social connotations that often far outweigh anything that can be expressed via language.[5]
Inducements towards physical intimacy can come from various sources. During colder seasons, humans as well as other animals seek physical intimacy with one another as a means to apportion thermoregulation.[6] Some forms of physical touch among monkeys and apes serve multiple functions, including cleaning, treatment of a lice influx or infection andsocial grooming.[7]
Some forms of physical intimacy may be received negatively. This attitude is especially marked amongst those withhaphephobia.[8] One study has shown that there is generally a higher level of physical intimacy allowed betweenimmediate family members than betweensecond-degree relatives.[9] Intimacy norms are usually more negative nearerogenous zones. Some jurisdictions may specify this as referring to thegenitals,buttocks and femalebreasts.[10]
Physical affection and intimacy appear to have a profoundly important role during infancy and childhood. The skin is the largest sensory organ and is the first to develop. Humans experience touch as early as fetal development, when the fetus begins receiving sensory information from coming in contact with the mothers' abdominal wall. In infancy, babies receive significant amounts of touch through being held, cuddled, and breastfed. In addition to necessary functions like breastfeeding, touch is also used to soothe and calm babies or with skin-to-skin contact called "kangaroo care".[11] Vision and auditory senses are limited in infancy and babies are introduced to their world primarily through touch and are able to distinguish between temperature and texture.[12]
Decreased amounts of affectionate touch from caregivers (i.e. for infants in institutional settings or infants with depressed mothers) is related to cognitive and neurodevelopmental delays.[13] These delays appear to persist for years and sometimes whole lifetimes.[14] Studies suggest that if depressed mothers give their infants massages, it benefits both the baby and themselves, increasing growth and development for the babies and leading to increased sensitivity and responsivity of the mothers.[15] There are also biologically beneficial effects ofinfant massage, with premature infants displaying lower cortisol levels after being held by their mothers. During the holding period, the mothers' cortisol levels also decreased.[16]

Most people value theirpersonal space and feel discomfort,anger oranxiety when somebody encroaches on their personal space withoutconsent.[17] Entering somebody's personal space is normally an indication of familiarity and intimacy. However, in modern society, especially in crowded urban communities, it is at times difficult to maintain personal space, for example, in a crowdedtrain,elevator or street. Many people find the physical proximity within crowded spaces to be psychologically disturbing and uncomfortable.[17] In an impersonal crowded situation, eye contact tends to be avoided. Even in a crowded place, preserving personal space is important. Non-consensual intimate and sexual contact, such asfrotteurism andgroping, are unacceptable.
People who are on afamiliar basis may enter into each other's personal space to make physical contact. These can be indicators of affection and trust. The manner in which people display affection is generally different in a public context to a private one. In private, people in anintimate relationship or who are familiar with each other may be at ease with physical contact and displays of affection, which may involve:
Bonding through intimate, non-sexual contact between platonic friends and family members includes, but is not limited to, holding hands, hugging, cuddling, and kissing on the cheeks.
In public, however, and depending on the nature of the relationship between the people, apublic display of affection is generally constrained bysocial norms and can range from a gesture, such as akiss orhug in greeting, to an embrace orholding hands. Maintainingeye contact can be regarded socially and psychologically as analogous to touching.
The role of touch in interpersonal relationships across development and in different cultures is understudied, however, some observational data suggests that in cultures who engage in more physical intimacy have lower rates of violence, demonstrated in adolescents and children.[18] Peoples living nearer to the equator (Mediterranean, central and South America, Islamic countries) tend to have high-contact social norms, whereas countries further from the equator tend to be lower contact (northern Europe, North America, northeast Asian). The public display of interpersonal touch and intimacy appears to vary across cultures as well.[19]
The term "skinship" (スキンシップ,sukinshippu) originated as apseudo-English Japanese word (wasei-eigo), which was coined to describe the intimacy, or closeness, between a mother and a child.[20][21][22] Today, the word is generally used for bonding through physical contact, such as holding hands, hugging, or parents washing their child at a bath. The term has been promoted by pediatrician and developmental psychologistNobuyoshi Hirai (平井信義), and he mentioned it was taken from a term coined by an American woman at aWHO seminar held in 1953.[23] The earliest citation of this word appears inNihon Kokugo Daijiten in 1971.[24] According to Scott Clark, author of a study ofJapanese bathing culture, the word is aportmanteau combining "skin" with the last syllable of "friendship".[25] The similarity with the English word 'kinship' suggests a further explanation.[22] Use of the word "skinship" in English publications seems to focus on the notion of sharing a bath naked, an idea known in Japanese as "naked association" (裸の付き合い,hadaka no tsukiai).[citation needed] It is not clear why the meaning shifted to the parent–child relationship whenborrowed back into English. This word is also used inSouth Korea.[26] The term is now described inOxford English Dictionary as a part of Korea-related update in 2021.[27]
Some animals participate in behaviors similar to physical affection in humans. Called social grooming or allo-grooming, these behaviors are less common outside of primates, while other species do perform these behaviors, primates seem to spend much more time doing this compared to other animals. Some species devote as much as 20% of their day to grooming behaviors, much of which is spent grooming others, rather than themselves.[28][29] In more social species the amount of time spent in self grooming is much less than the time spent in social grooming. While these behaviors may appear to be for the purpose of hygiene (i.e. removal of parasites, fur cleanliness, etc.), evidence suggests that grooming behaviors perform a unique social function which facilitates bonding.[28] From an evolutionary perspective, the amount of time being devoted to allo-grooming appears to exceed the amount of time in which it would be adaptive, therefore underscoring the idea that grooming must have a purpose beyond hygiene maintenance. Furthermore, there are core grooming partnerships which remain quite stable and do not change frequently, sometimes with the same partners on the timescale of years.[30]
Some argue that grooming is something which is exchanged like a service with the expectation that equal amounts of time will be spent or reciprocated by their grooming partner.[31] Primates tend to groom each other equal amounts of time or with the expectation that they will be reciprocated with defense in a dangerous situation. Primates who spend more time grooming each other are more likely to defend each other when attacked. Although it is not clear how this effect is brought about, in all likelihood it is the protective effect that known relationships have: more dominant animals are less likely to attack or harass an individual who is known to have grooming partners who might come to its aid. However, the likelihood of a female going to the aid of another female when the latter is under attack is significantly correlated with the amount of time the two of them spend grooming with each other.[32] A more plausible interpretation is that grooming provides the psychological underpinning for an individual's willingness to offer subsequent support.[33] It does this not by offering a direct exchange of benefits, but rather by creating the psychological environment that allows support to be traded mutually.