When individuals are asked which event would upset them more-a partner's emotional infidelity or a partner's sexual infidelity-among heterosexuals more men than women select a partner's sexual infidelity as the most distressing event, whereas more women than men select a partner's emotional infidelity as the most upsetting event. Because homosexuals' mating psychology is unlike that of heterosexuals, the present study examined which of these two events is more upsetting in a sample of 237 Dutch homosexuals. In support of our hypothesis it was found that, whereas gay men more often than lesbian women chose a mate's emotional infidelity as the most upsetting event, lesbians more often than gay men chose a mate's sexual infidelity as the most upsetting event. In addition, analyses showed that the effect of participant sex on infidelity choice was mediated by beliefs with regard to the co-occurrence of sexual and emotional infidelity. Apparently, with respect to choosing the most upsetting type of infidelity of their partner, homosexuals resemble heterosexuals of the opposite sex. Several explanations are discussed for this finding.

The goal of the present study was to examine the emotional content and intensity of jealousy in response to different types of infidelity (both online and offline unfaithful partner behaviors) among Dutch heterosexuals (n = 191) and homosexuals (n = 121). Based on previous research (Dijkstra, Barelds & Groothof, 2010), participants were presented with ten jealousy-evoking situations following which the intensity of two different emotional aspects of jealousy was assessed (betrayal/anger and threat). Results showed that scenarios describing a partner having sex with someone else or falling in love with someone else primarily evoked betrayal/anger-related jealousy, whereas scenarios describing an emotional connection between a partner and someone else primarily evoked threat-related jealousy. In addition, women experienced more jealousy than men in response to scenarios in which a partner engaged in potentially extra-dyadic online (but not offline) behaviors. Finally, compared to same-sex heterosexuals, homosexuals, both male and female, responded with less intense jealousy to scenarios describing a partner having sex with someone else. Implications for the treatment of (internet) infidelity are discussed.

The goal of the present study was to identify the most important jealousy-evoking partner behaviours and to examine the extent to which these behaviours evoke jealousy. Based on the literature, a questionnaire was constructed containing 42 jealousy-evoking partner behaviours, including a partner's extra-dyadic involvement with someone else by means of modern communication devices, such as the Internet. A second study examined the extent to which undergraduates and a community sample experienced jealousy in response to these partner behaviours. Results showed that explicit unfaithful behaviours evoked most feelings of jealousy, followed by a partner's emotional or romantic involvement with someone else by means of modern communication devices. In general, older individuals responded with less jealousy in response to a partner's unfaithful and suspicious behaviours. Clinical implications are discussed.

Studies investigating the events that elicit men's and women's jealousy consistently show that men's jealousy, more than women's jealousy, is triggered by a mate's sexual infidelity, and women's jealousy, more than men's jealousy, is triggered by a mate's emotional infidelity. Internet infidelity poses new challenges for modern couples. Therefore, the present study investigated men's and women's responses to emotional and sexual infidelity over the Internet. Results from both a student sample (n = 254), and a sample from the general population (n = 483) showed that sex differences in response to Internet infidelity parallels those for offline infidelity. Implications and explanations for this finding, as well as different results between both samples, are discussed.

In this study (N = 96), the role of social comparison in evaluating the quality of one's friendships and social relationships was examined. Participants who were exposed to a comparison target with a very dissatisfying social life evaluated their own social life as better than participants who were exposed to a comparison target with a very satisfying social life. However, this effect was only found among individuals high in the individual characteristic social comparison orientation. It is concluded that only individuals with a dispositional tendency to compare themselves with others will base the evaluation of their social life to an important extent on what they see in others. KEY WORDS: close relationships • downward comparison • satisfaction • social comparison orientation • social relationships • upward comparison Journal of Social and Personal Relationships