“…One of the main predictors of whether a person likes another person is similarity ( Byrne & Nelson, 1965 ). The so-called similarity hypothesis has received a lot of support with regard to personality traits such as optimism in romantic relationships ( Böhm, Schütz, Rentzsch, Körner, & Funke, 2010 ), personality and physical attractiveness in roommate relationships ( Carli, Ganley, & Pierce-Otay, 1991 ), humor style in married couples ( Hahn & Campbell, 2016 ), gender-role self-concept and selection of dating partners ( Morell, Twillman, & Sullaway, 1989 ), socially undesirable traits such as Machiavellianism ( Ináncsi, Láng, & Bereczkei, 2016 ), and same-sex friendships regardless of duration or closeness ( Morry, 2005 ). The meta-analytic effect of interpersonal attraction and perceived similarity was estimated to be r = .39 ( Montoya, Horton, & Kirchner, 2008 ).…”