The concept that describes how people are attracted to others, which is the opposite of "opposites attract", is often referred to as "similarity-attraction theory" or "like attracts like". This theory suggests that individuals are more likely to be attracted to others who share similar characteristics, values, attitudes, and interests.
This can include a wide range of similarities such as age, religion, socio-economic status, education level, personality traits, physical attractiveness and even shared hobbies or passions. The idea behind this theory is that when two people have a lot in common, they are likely to understand each other better and have more in common to talk about or do together. This shared understanding and commonality can lead to a stronger bond and attraction.
Research has consistently supported the similarity-attraction theory. For instance, studies have found that married couples tend to be similar in terms of age, education level, and attitudes towards various issues. Similarly, friendships often form between individuals who share common interests or hobbies.
However, it's important to note that while similarity often leads to attraction, it's not the only factor at play. Other factors such as proximity (how physically close two people are), familiarity (how well two people know each other), and reciprocity (the mutual exchange of feelings or actions) also play significant roles in attraction.