This study examined attachment styles, online behaviours, offline relationships, and sexuality of individuals engaged in a popular massive multiplayer online (MMO) game (Game of War: Fire Age). 178 players currently involved in romantic relationships completed surveys for in-game currency. Time spent gaming predicted less time with others, less relationship satisfaction, more relationship uncertainty, more sexual anxiety, and more external sexual control. However, attachment avoidance partially mediated the relationship between time spent online gaming and time spent with immediate family and friends; relationship satisfaction; self-partner, and relationship uncertainty; sexual anxiety; and external sexual control.