Previous work has begun to incorporate psychological constructs into our understanding of media multiplexity (i.e., use of multiple media in a single interpersonal relationship). Following this approach, this investigation examined how a user's enjoyment of a communication medium might both predict medium use frequency and alter the extent to which closeness is an outcome of such use. Results supported this model across six popular interpersonal communication media (voice telephone, text messaging, e-mail, instant messaging, video chat, and social networking sites) in relationships with extended family members. Specifically, at low levels of medium enjoyment, use of a medium was not associated with relational closeness. Practically, these results suggest that communicating via an unsatisfying medium may not foster relational closeness; theoretically, these results argue for including psychological processes to strengthen MMT as a theory of interpersonal media choice. (C) 2015 Elsevier Ltd. All rights reserved.