In the early stages of romantic relationships, sexual desire is often intense, but over time, as partners get to know each other, desire tends to decline. Low sexual desire has negative implications for relationship satisfaction and maintenance. Self-expansion theory suggests that engaging in novel activities with a long-term romantic partner can reignite feelings of passion from the early stages of a relationship. Across 3 studies using dyadic, daily experience, longitudinal, and experimental methods, we find evidence for our central prediction that engaging in self-expanding activities with a partner is associated with higher sexual desire. In turn, we found that higher desire fueled by self-expansion is associated with greater relationship satisfaction. Self-expansion, through sexual desire, is also associated with an increased likelihood that couples will engage in sex, and when they do engage in sex, they feel more satisfied with their sexual experiences. We also demonstrate that the benefits of self-expansion for relationship satisfaction are sustained over time, and that the effects cannot be attributed solely to increases in positive affect, time spent interacting with the partner or closeness during the activity. Implications for selfexpansion theory and sexual desire maintenance in relationships are discussed.

Self-expansion in intimate relationships (i.e., broadening one’s perspective through engaging in novel, exciting activities with a partner) has been associated with relationship benefits. The goal of this study was to propose a motivational model of self-expansion to understand what prompts people to engage in self-expanding activities in their relationship on a daily basis. We hypothesized that when people report stronger daily approach relationship goals (i.e., goals focused on pursuing growth, intimacy, and rewards), they would report a greater likelihood of engaging in novel, exciting activities that enhance self-expansion and ultimately promote greater satisfaction in romantic relationships. To test our model, we recruited 122 couples for a 3-week daily diary study. In support of our hypotheses, on days when people (or their partners) reported higher than their usual approach relationship goals, they reported higher relational self-expansion, which was due, in part, to a greater likelihood of engaging in novel, exciting activities with the partner. In turn, higher relational self-expansion was associated with higher daily relationship satisfaction. Our findings have implications for understanding what promotes relationship growth on a day-to-day basis and the outcomes of daily approach-oriented relationship goals.

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Four studies examined how mental abstraction affects how people perceive their relationships with other people, specifically, how these relationships may be categorized in social groups. We expected that individuals induced to think abstractly would report fewer more global social groups, compared to those induced to think concretely, who would report more specific groups. However, induced abstract mindset did not affect how people structured their social groups (Study 2–4), despite evidence that the mindset manipulation changed the level of abstraction in their thoughts (Study 3) and evidence that it changed how people structured groups for a control condition (household objects, Study 4). Together, these studies suggest that while the way people organize their relationships into groups is malleable; cognitive abstraction does not seem to affect how people categorize their relationships into social groups.

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