Whites in interracial relationships have 0.22 SD lower IQ. Blacks in interracial relationships have 0.31 SD higher IQ. Hispanics in interracial relationships have 0.73 SD higher IQ. Hispanics in interracial relationships are 0.29 SD taller. Interracial daters show more risk-taking across races (White d=0.18, Black d=0.42, Hispanic d=0.53). Mixed-race adolescent problems stem from genetic transmission of parental traits. Interracial relationships have more conflict due to self-selection, not racial tension. Assortative mating for IQ occurs across races. Miscegenation reduces cognitive elites by disrupting within-race IQ mating. Cross-racial IQ assortment partially offsets dysgenic effects. Outbreeding depression does not explain mixed-race issues. Admixture effects on IQ are linear. Risk-taking predicts interracial dating in all major races. Parental education differs strongly for interracial Hispanics (p=0.0000000002). IQ gaps between interracial and endogamous daters are huge for Hispanics (11 points). Attractiveness weakly predicts interracial dating. Multiple partners link holds after bias correction. Big Five personality measures too poor to predict. Asians excluded due to small sample. High-status race dating shows similar patterns.