positive assortative mating Archives - The Diversity of LoveThe Diversity of Love

“Similarity psychology” and positive assortative mating play an important role in love relationships. We like others who are not only beautiful but also similar to ourselves.

It seems natural to like and love those who are beautiful. Men and women tend to favor physically attractive men and women. When asked, they frequently express their preferences for good-looking prospective partners (Buss and others). Do they really choose those with attractive appearances for a relationship? Are men more likely to fall in love with beautiful women than women are to fall in love with handsome men?

Do We Love Others Who Are Beautiful or Similar to Us?

The puzzle remains: if beautiful women and men are so attractive, why don’t we fall in love with the most beautiful ones? Three explanations are possible.

Men and women perceive them as beautiful yet unattainable. The anxiety of not being accepted by a beautiful person makes them cautious, even subconsciously, to avoid the frustration of implied and tacit rejection. This might work as a psychological defense mechanism.
It is possible that we love someone for reasons other than their beauty. Beauty just adds to our admiration. However, causation can also work in the opposite way: we perceive our beloved as beautiful because we love him or her.
People tend to prefer homogamy in relationships and similarity with another person in their physical appearance and other personal, social, and cultural features.

Let us consider how “similarity psychology” and positive assortative mating work in love relationships.

“Similarity Psychology” Attracts Us to Similar Men and Women

The early studies showed that partners in marriage were more likely to resemble each other than to differ in physical and psychological traits, even though those similarities and differences varied among social characteristics (Brockner & Swap, 1976; Burgess & Wallin, 1943).

The similarity in values, beliefs, attitudes, and personality traits also plays a role in the choice of a mating partner. Partners with similar attitudes, as well as those who see each other more frequently, are more attracted to each other in general (Aron et al., 1989; Byrne et al., 1971).

The studies in different cultures confirmed these tendencies.

In the 1990s, a large survey of the Spanish population showed that individuals are more likely to fall in love with potential partners who they view as similar to themselves in physical attractiveness (Yela & Sangrador, 2001).

Due to romantic idealization, they have a positive bias toward a partner and perceive him or her as a little more attractive than themselves. Over the course of a long-term relationship, habituation diminishes the value of the partner’s physical attractiveness. Over time, familiarity and cognitive dissonance counterbalance physical attractiveness. The role of these and other attributes increases.

How Positive Assortative Mating Works

There is strong evidence that people who prefer positive assortative mating choose to mate with those who are similar to themselves. This type of selection—also called homogamy—is quite common in several individual characteristics.

Positive assortative mating also works with physical traits. For example, a person of short stature tends to mate with another person of similar height. This tendency of men and women to select mating partners with similar phenotypes motivates them to fall in love with those of similar physical appearance.

Many studies have demonstrated that individuals prefer relationships with others who have physical characteristics similar to themselves (e.g., Bereczkei et al., 2002; Zajonc et al., 1987).

Furthermore, individuals decide to initiate a dating relationship with those whose “social desirability” is similar to their own. They are associated with a lower likelihood of possible rejection (Berscheid et al., 1971).

Why Do Mates Look Alike?

Two effects can play roles in such preferences:

early childhood imprinting and
self-referent phenotype matching.

The relationship with caregivers during childhood plays a role. The early childhood imprinting of caregiving experiences can shape the expectations of desirable partners for mating (e.g., Bateson, 2004; Bereczkei et al, 2004).

Specifically, due to sexual imprinting, people see others they grew up with as sexually attractive. The opposite-sex caregiver’s phenotype can be used as a model for future mate preference. This can be a parent, stepparent, or other early caregiver with whom a child spends much of their time in the early years. For example, women tend to choose partners that resemble their adoptive fathers (Bereczkei et al., 2004).

Due to self-referential phenotype matching, an individual may prefer a person who resembles themselves. Or, alternatively, the homogamy can be due to the sexual imprinting of the parents in childhood. The results of the study demonstrated that a tendency to homogamy in facial characteristics between partners in a relationship really exists and occurs largely due to self-referent phenotype matching and, to some degree, due to sexual imprinting (Nojo et al., 2012).

Do Partners Become Alike Over the Course of a Relationship?

Since men and women prefer phenotypically similar mates, this leads to mating homogamy in physical traits between partners.

Another factor can also play a role in increasing facial homogamy.

One study demonstrated that partners who live with each other for a long period of time become physically similar in their facial features. Their facial similarity increases and becomes apparent after 25 years of cohabitation. Moreover, those with such an increasing resemblance experienced greater marital happiness. The authors proposed a “vascular theory of emotional efference” (VTEE) to explain this effect (McIntosh, Zajonc, et al., 1997; Zajonc et al., 1987).

According to this idea, emotional processes cause vascular alterations that are influenced in part by facial musculature. The face muscles are thought to operate as ligatures on veins and arteries, allowing blood to be diverted away from or directed toward the brain. As a result, habitual usage of facial musculature may have a long-term effect on facial features. Two people who have lived together for a long time will develop physical similarities in their facial features as a result of frequent empathic imitation. Kin resemblance may thus be more than just a result of shared genes but also of long-term social contact and the mere exposure effect.