Personality

Opposites Can Attract But Similarity Brings Stability

Difference can spark interest, but what leads to long term stability in couples?

Posted November 6, 2026

Media narratives, pop songs, and prevalent cultural beliefs gesture to the notion that “opposites attract” in romantic relationships. But is there any evidence that this is the case? In a systematic review of 199 peer-reviewed studies, Horwitz and colleagues (2023) showed that partners in couple relationships have up to 89% of their core traits and values in common. The most significant overlapping traits included educational attainment and substance use. What else do partners tend to share?

Values. Research covering millions of couples shows partners align heavily on religion, politics, habits, and life goals. One can readily see, with the polarization we see in social and political views today, that a progressive person and a right-wing person probably would experience major difficulties, so this makes a lot of sense.

Talents vs. values. While core values and lifestyle habits ideally should match, differences work best in terms of practical talents or skills (e.g., one partner builds things while the other handles logistics). One partner may suggest a destination for a trip, and the other may plan out in advance all the components for a smooth trip.

Homophily. People naturally gravitate toward "kindred spirits" who reflect their own personalities rather than opposing ones. Yes, someone being fun-loving, carefree, and up for anything may be attractive traits when one first meets someone, but after that initial rush and blush, what do the two of you have to fall back on in terms of core personality characteristics?

A notable exception: Complementarity in couples. The discussion of talents versus value and homophily above gestures to the exception to the rule: An important factor in couple relationships is where partners can balance each other out along the lines of personality and abilities. For instance, one partner can be quite sociable, gregarious— a people person—whereas the other might be more shy, quiet, and retiring and leaves the social calendar to their social butterfly partner. The more extraverted partner can “shore up” or counterbalance the other’s lower inclination towards socializing, if their differences in extraversion do not drive them crazy.

However, speaking as a couples therapist, I can assert that partners can and do evolve over time and “rub off” on one another over decades such that they both can change and move “toward the middle” on personality dimensions. For example, the more extraverted partner can move toward the midrange of the extraversion-to-introversion continuum and begin to value solo time to read, write, and recharge, and the other formerly shy wallflower can become more loquacious and comfortable with going out and spending time with others, so much so that they might begin demonstrating initiative in this regard, even arranging social events, whereas before this would never have happened. In other words, differences between partners can not only balance each other out but also spur change over time towards each becoming more balanced within themselves.

A long-term reality. While brief sparks or a kind of fascination can happen with someone who presents as very different from ourselves, long-term romantic stability stems mostly from common ground between partners. During a speed date, checking what’s different and what’s the same in terms of personality, goals, and values can provide valuable data to decide if this is a relationship that stands the test of time.

Read the original article on Psychology Today →