This study examined pathways between postformal reasoning, sex role characteristics, and environmental factors. Thirty-two female and 29 male undergraduate college students participated. A demographic questionnaire assessed age, sex, marital status, family structure, family income when growing up, female and male siblings, education level, and expected salary upon graduation. The Social Paradigm Belief Inventory (Kramer, Kahlbaugh, & Goldston, 1992) assessed absolute, relativistic, and dialectical reasoning. The Bem Sex Role Inventory (Bem, 1974) assessed participants’ masculine and feminine sex role factors. Relationships existed between age find reasoning and between certain sex role characteristics and types of reasoning. A path or link connects one’s family income while growing up to endorsement of certain sex role characteristics which, in turn, leads to particular types of reasoning.