Explains why, despite an "ideal" for attractiveness, most of us find mates or partners.

That would be matching attractiveness.  According to the Elaine Hatfield and her associates that first proposed the matching hypothesis in 1966, the people would thrive more and be more successful in a relationship with someone of similar social desirability status. This is why according to them some people will overlook the difference in physical attractiveness and get attached to their partner.  

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