The current research tested whether the concept of infidelity is prototypically organized and whether laypeople's conceptualizations of infidelity are consistent with how researchers have operationalized this construct. Across 4 studies, results indicated that infidelity is indeed prototypically organized as individuals are able to list and rate how central certain features are to the infidelity construct. Furthermore, there was evidence that the centrality ratings influenced how individuals processed information in a series of memory tasks and narratives about infidelity experiences. Laypeople are less likely than researchers to consider the presence of particular behaviors (i.e., flirting, kissing, and sexual intercourse) as defining qualities of infidelity. Instead, laypeople focus more on the concealment of behaviors and the resulting emotional fallout from infidelity.