According to Festinger (1954) people need to evaluate their opinions and abilities to be able to act in the world. Therefore, people use social comparisons, the utilization of information about others for the purpose of self-assessment, to evaluate their experiences and react accordingly. Since it was originally proposed by Festinger (1954), Social Comparison Theory has been extended to include two different types of comparisons, upward and downward social comparisons (Willis, 1981). An upward social comparison occurs when a person compares themselves with someone viewed as better off than they are. Research has suggested that upward social comparisons can lower self-regard (Brown, Novick, Lord, & Richards, 1992; Cash, Cash, & Butters, 1983; Thornton & Moore, 1993), although it has also been suggested that these comparisons may provide inspiration to improve oneself (Brewer & Weber, 1994; Brickman & Bulman, 1977; Brown et al., 1992; Buunk, Collins, Taylor, VanYperen, & Dakof, 1990; Lockwood & Kunda, 1997). In contrast, a downward comparison occurs when a person compares themselves with someone who is viewed as worse off than they are. Downward comparisons can elevate self-regard, and increase one's subjective well-being (Cash, Cash, & Butters, 1983; Wills, 1981; Wood, Taylor, & Lichtman, 1985). Social comparisons have been demonstrated to occur in a number of areas of social life that are relevant to sexuality, including romantic relationship comparisons (White, 2010), relational standards (Wayment, 2005), perceptions of peers’ sexual behaviour (Martens, Page, Mowry, Damann, Taylor, & Cimini, 2006), and comparisons to media portrayals of romantic relationships and sex (Aubrey, Harrison, Kramer, & Yellin, 2003; Ward, 2003). However, the majority of research regarding social comparisons in romantic relationships has focused on comparisons between romantic partners or between one’s partner and potential alternative partners (e.g. comparisons regarding mate value), and very few have examined comparisons within the context of sexuality (e.g. Day, Muise, & Impett, 2017). Thus, the current research examines the relational consequences of comparisons to the sex lives of others using a 28-day daily diary design. In particular, we hypothesize that romantic partners who are less satisfied with their relationship (both relationally and sexually) and have lower individual well-being will make upward comparisons more frequently than those who are more relationally and sexually satisfied and have higher levels of individual well-being (H1). In other words, we predict that participants’ average relationship satisfaction, sexual satisfaction, and individual well-being will be negatively associated with their frequency of upward comparisons across the diary days. This association could be due to individuals being more likely to make downward comparisons when dissatisfied, consistent with previous research demonstrating that social comparisons are particularly likely during periods of change and stress (e.g. Taylor, Buunk, & Aspinwall, 1990), uncertainty (Butzer & Kuiper, 2006), and insecurity (Gibbons & Buunk, 1999). However, this association could also be attributable to upward sexual comparisons leading to dissatisfaction and decreased well-being, consistent with previous research demonstrating an association between upward comparisons and negative outcomes (e.g. negative affect, lower self-regard), likely due to being reminded of one’s inferiority (Diener, 1984; Marsh & Parker, 1984; Morse & Gergen, 1970; Salovey & Rodin, 1984; Tesser, Millar, & Moore, 1988; Testa & Major, 1988; Thornton & Moore, 1993). In contrast, we predict that participants’ average relationship satisfaction, sexual satisfaction, and individual well-being will be positively associated with the frequency of downward comparisons across the diary days (H2). Downward social comparisons are typically positively associated with well-being, self-esteem, positive emotion, and reduced anxiety (Amoroso & Walters, 1969; Cash, Cash, & Butters, 1983; Crocker & Gallo, 1985; Gibbons, 1986; Hakmiller, 1966; Kiesler, 1966; Lemyre & Smith, 1985; Morse & Gergen, 1970; Wills, 1981; Wood, Taylor, & Lichtman, 1985), and we propose these benefits will extend to relationship outcomes. Finally, with a subsample of the participants who made 2 or more comparisons during the course of the diary study, we will examine the association between relationship and sexual satisfaction and engagement in sexual comparisons. Consistent with our previous hypotheses, we predict that satisfaction will be lower on days when participants make upward comparisons, and higher on days when they made downward comparisons (H3). References Amoroso, D. M, & Walters, R. H. (1969). Effects of anxiety and socially mediated anxiety reduction on paired-associate learning. 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