According to the attraction–similarity model, relationship quality leads to perceptions of partner–self similarity.
Relationship quality and perceived similarity then provide psychological benefits for the perceiver.
Interpersonal attraction is the attraction between people which leads to friendships and to platonic or romantic relationships.
Interpersonal attraction, the process, is distinct from perceptions of physical attractiveness, which involves views of what is and is not considered beautiful or attractive.
Repulsion is also a factor in the process of interpersonal attraction; one's conception of "attraction" to another can vary from extreme attraction to extreme repulsion.
In addition, similarity has been found to be important in many different cultures (e.g., Byrne et al., 1971).
The similarity-attraction hypothesis refers to the principles that people become attracted to those who are similar to them, are more satisfied in relationships with similar others, and dissolve relationships when there are dissimilarities (Morry, 2009).
Or do we, instead, find similarities with those to whom we are attracted?
In this instance it appears as though commonsense is wrong or, at minimum, not telling the full story.