This article considers whether the density of a person's social network is related to his/her moral attitudes toward infidelity. Integrating recent sociological thinking on moral schemas with network theory's insights about deviance and structural independence, I employ data from a representative sample of American men aged 57–85. Findings indicate that men with the densest personal networks are least likely to condone infidelity. This association, moreover, was independent of men's education, their beliefs about religion and sex, and attitudes about their partners, among other factors. The findings imply an affinity between micro‐social structure and moral judgment, suggesting that network density can help constrain even the expression of moral attitudes.