Whites in interracial relationships have 0.22 SD lower intelligence. Blacks in interracial relationships have 0.31 SD higher intelligence. Hispanics in interracial relationships have 0.73 SD higher intelligence. Hispanics in interracial relationships are 0.29 SD taller. Interracial daters show more risk-taking behaviors across races with White d=0.18, Black d=0.42, Hispanic d=0.53. Assortative mating occurs between races for intelligence and other traits. Self-selection of deviant individuals causes higher conflict, divorce, and violence in interracial relationships. Mixed-race adolescents' drug use and violence stem from genetic transmission of heritable parental traits. Interracial relationships among minorities also fail more than monoracial ones due to self-selection. Cross-race IQ assortment partially offsets dysgenic effects of miscegenation on cognitive elites. No evidence for outbreeding depression in polygenic traits like IQ and personality. Attractiveness weakly predicts interracial dating. Multiple datasets confirm consistent IQ and parental SES patterns. Tiny p-values like 0.0000000002 for Hispanic parental education differences rule out chance. Risk-taking finding replicates across races unlikely coincidental.