The repeated exposure that comes with proximity also builds a sense of familiarity. The mere exposure effect describes the tendency for people to develop a preference for familiar people and things. Simply seeing another person regularly can build liking, even for people who do not actually know one another. This effect also happens outside the social arena. For example, people often do not like new songs but find that the song grows on them after they hear it repeatedly.
Similarity also influences relationship formation. Individuals are more likely to become close to people who share similar backgrounds, beliefs, and ways of life. Homophily is the tendency for people to form friendships, romantic relationships, and business partnerships with those who are similar to themselves. Being surrounded by similar people can provide a sense of safety and familiarity, but it can also limit a person's exposure to different points of view and life experiences.
Reciprocity means that a relationship is a two-way street. Individuals tend to prefer spending time with others who devote equal effort to the relationship. For example, if one person in a friendship is always the one to reach out to make plans, the relationship may fade. If one person always talks about themselves without listening to others, they are likely to find friends dropping away. Relationships that are fair and equitable are more likely to last than those that are not.
Love and Attraction
Youth and health are also attractive. From an evolutionary perspective these traits suggest a high likelihood of fertility and reproductive potential. In women these indicators include large eyes, high cheekbones, and a slim waist with wider hips. For men these indicators include a tall stature, broad shoulders, and a narrow waist. Men value signs of youth in romantic partners more than women do. Around the world, women tend to place more value on evidence that a partner will be a reliable provider for a family.
Attraction is also shaped by culture. In Asia, for instance, pale skin is considered highly attractive, especially for women. The Asian beauty industry is awash with skin-lightening and "bleaching" creams to whiten skin. In the United States, however, bronzed skin remains a popular beauty symbol, and self-tanners fill health and beauty shelves. In countries with a surplus of food, slender bodies are considered more attractive. In eras and cultures with food shortages, heavier bodies are considered more attractive.
Personality traits and social norms contribute to physical attraction as well. Appealing traits in women include warmth, affection, and openness. Traits such as ambition, leadership, and stoicism (lack of emotional expression) are considered conventionally attractive in men. Despite recognition of universally attractive features, not everyone seeks out the most stereotypically attractive partner possible. The matching hypothesis suggests that people tend to choose someone they consider their equal in terms of physical attractiveness and social desirability.
The emotional aspect of romantic relationships can take various forms. Psychologist Elaine Hatfield introduced a model comprising two types of love: passionate and companionate love. Passionate love involves intense feelings and sexual attraction, also known as lust. This type of love is more common during the early stages of an intimate relationship. Companionate love is built on mutual respect, trust, appreciation, and affection. This type of love grows over time as the relationship strengthens between two partners or friends.In 1986 psychologist Robert Sternberg proposed a triangular theory of love. This theory states there are three components of romantic love: intimacy, passion, and commitment. Intimacy is the sharing of intimate feelings and thoughts. Passion is physical attraction and desire. Commitment refers to standing by one's partner no matter what. Sternberg theorized that romantic relationships can take many forms based on combinations of those three components. Consummate love, which combines intimacy, passion, and commitment, is the form of love typically portrayed in romantic stories. Consummate love is not the norm for real relationships because passion tends to decline as a relationship progresses. However, intimacy and commitment can increase over time.