The possible sex difference in preferred mate characteristics is a domain that is receiving more attention as of late, due to the increases in new forms of dating and new conceptualizations of attraction. Evolutionary theory posits that men are attracted to cues signaling reproductive value and women are attracted to resources and personality traits, while more social-based theories rely on societal pressures explaining the way men and women behave when it comes to attraction. The present study found that men and women may not differ in terms of how important they rate general physical attractiveness and shared values. However, women did value long-term relationships more and monetary potential more, while men rated characteristics like eye color, hair color, and weight as more important. Further, relationship longevity was only predicted partially by certain aspects of real-life relationships, but not ideal mate preferences. These findings suggest that a simple evolutionary approach to mate preferences research may not be completely sufficient in today's society. The literature on young-adult mate preferences and relationships is extensive, yet many of the reported findings are contradictory and inconclusive. This study was designed to provide additional information regarding several issues of interest to relationship researchers, including the correlation between expressed preferences and demonstrated preferences; sex differences in preferred mate characteristics; and factors associated with relationship duration in young adults. Recent research on expressed preferences and demonstrated preferences has yielded inconclusive results. For example, Eastwick, Finkel, and Eagly (2011), compared self-reported mate preferences with preferences demonstrated in live-interaction situations and found significant differences. In contrast, Burris, Welling, and Puts (2011) found that women who express a preference for more masculine faces tend to have more masculine partners. Methodological differences between the studies make it difficult to draw definitive conclusions about the correlation between expressed and demonstrated mate preferences. Research on attractiveness tends to focus on initial attraction. In relationship research, though, changes in ratings of attractiveness are also of interest. Reis et al. (2011) found that simply spending more time with someone in a live-interaction can make that person seem more attractive. The traditional view of sex differences in mate preferences is that men tend to value traits signaling physical attractiveness and reproductive capacities, and women tend to value traits signaling stability and resource acquisition (Buss, 1989; Li & Kenrick, 2006, Li et al., 2013; Sprecher, Sullivan, & Hatfield, 1994). Much of the theory in this area stems the work of Trivers (1972), who argues that women invest more in parenting and are therefore more discriminating in mate selection. Men, who traditionally carry less of the responsibility of having and raising a child, are less selective. From an evolutionary perspective, the cost of wasting one's reproductive resources is less for men than it is for women. Women are thought of as the choosier sex because they can spread their genes to the next generation best by securing resources over the 9 months of pregnancy. Men, however, may be better suited pursuing other sexual partners in that time, in order to enhance their chances of progeny in the next generation (Trivers, 1972; Feingold, 1992; Bjorklund & Shackelford, 1999). Just as sex differences in mating preferences have been interpreted from an evolutionary perspective, so have sex differences in relationships. This could be thought of as the difference between relationship preferences and pursuit, and actual relationship maintenance once in a committed relationship. Some relationships are found to involve jealousy induction, an intentional tactic used to make a romantic partner jealous. This type of behavior is typically correlated with lower relationship satisfaction and commitment (Mattingly, Whitson, & Mattingly, 2012). Other relationships are potentially volatile because of too much jealousy in particular domains. Many studies have shown that men are more distressed by potential sexual infidelities, while women are more distressed by potential emotional infidelities (Buss, Larsen, Westen & Semmelroth, 1992; Edlund & Sagarin, 2009; Sagarin, Becker, Guadagno, Wilkinson, & Nicastle, 2012). In comparison to men, women have been found to show heightened jealousy in romantic relationships. Sagarin and Guadagno (2004), for example, found that women more often than men report " extreme jealousy ". These studies lend support to evolutionary models of human mating behavior. As would be expected from an evolutionary perspective, meta-analytic work has shown that women prefer taller partners, or partners who are at least as tall as