“…Using assortative mating 3 For more on the relationship between earnings and academic major choice, see Daymont and Andrisani (1984), Berger (1988), James et al (1989), Grogger and Eide (1995), Loury and Garman (1995), Loury (1997), Blundell (2000), Bratti and Mancini (2003), Arcidiacono (2004), Kelly et al (2010), Arcidiacono et al(2011), Andrews et al (2012), and Wiswal and Zafar (2012). arguments and observed facts, Kanazawa and Kovar (2004) provide indirect evidence suggesting why beauty and intelligence should be positively correlated in humans. Satoshi (2011) shows empirically that there is a positive association between IQ test results and physical attractiveness in British and American children of both sexes.…”