Running head: JEALOUSY AND PARENTING 1 In Press: Personality and Social Psychology Bulletin (Not) Bringing up Baby: The Effect of Jealousy on Men’s and Women’s Parenting Interest and Investment Expectations

The current research uses insights from evolutionary psychology and social cognition to explore the relationship between jealousy – both experimentally activated and chronically accessible – on men’s and women’s desire to start a family and invest in children. In our first two studies, primed infidelity threat led chronically jealous men and women to report a decreased interest in infants (Study 1) and decreased happiness upon receiving pregnancy news (Study 2) relative to controls. Study 3 demonstrated sex-differentiated effects of jealousy on men’s and women’s desired level of parental investment, with infidelity threat decreasing desired investment among chronically jealous men – but not women. Results provide novel empirical support for the hypothesis that jealousy functions to attenuate the reproductive costs associated with partner infidelity.