“…The second body of theory, here called reproductive theory, posits that religion has developed not because of its effects on cooperation, but instead because of its effects on sexuality and reproduction (Deak & Saroglou, 2015; Moon, Krems, Cohen, & Kendrick, 2019; Reynolds & Tanner, 1995; Rigo & Saroglou, 2018; Saroglou, 2019; Schmitt & Fuller, 2015; Shaver, 2017; Shaver, Sibley, Sosis, Galbraith, & Bulbulia, 2019; Strassmann et al, 2012; Weeden & Kurzban, 2013). Reproductive theory starts with the observation that promiscuity (e.g., male abandonment and female cuckoldry) undermines the sexual strategies of people who choose instead to pursue sexual strategies characterized by monogamy and extensive investment in one’s offspring.…”