https://briannox.com/ for more tips and in-depth videos. Getting my book for free on audible when you start a trial? https://briannox.com/audible/ https://amzn.to/2Fnf2xD to find all my books on Amazon.com (This is an Amazon Affiliate Link. As an Amazon Associate, I earn from qualifying purchases.) Some of the studies I mention: Feingold, A. (1992). Gender differences in mate selection preferences: A test of the parental investment model. Psychological Bulletin, 112(1), 125–139. Mate preferences: A cross-cultural investigation European Journal of Social Psychology Eur. J. Soc. Psychol. 37, 288–296 (2007)