Individuals reporting greater insecure attachment are more likely to report maladaptive sexual motivations, such as sex to avoid negative relational and personal outcomes (e.g., conflict). Despite the costs of such sexual motivations, research is less clear regarding what might buffer the extent to which attachment insecurities manifest in such motives. The current study examined whether trait mindfulness moderates the links between attachment insecurity and maladaptive sexual motives. Participants (N = 194) completed measures of trait mindfulness, general sexual motivations, and attachment. As predicted, the links between attachment anxiety and having sex to cope and affirm the self were eliminated among individuals reporting higher levels of the acting with awareness facet of trait mindfulness. No such buffering effects were seen for attachment avoidance. Instead, acting with awareness mindfulness appeared to increase the extent to which more avoidantly attached individuals reported coping and self-affirmation-based sexual motives. These findings contribute to knowledge regarding the potential utility and limits of mindfulness in relational and sexual contexts, perhaps suggesting that mindfulness may help anxiously attached individuals manage the extent to which attachment concerns manifest in maladaptive sexual motivations. Findings of the study may inform both theory regarding mindfulness in interpersonal functioning and how mindfulness interventions might be deployed in sex therapy contexts.