Similarity - Dissimilarity -------------------------- One promising possibility is that the buffering effects of concordant pornography use may simply illustrate a discrete example of the role that partners' similarity - dissimilarity may play in relationships. We know, for example, that similarity in attitudes (Montoya & Horton, 2013), as well as similarity in activity (Werner & Parmalee, 1978) and entertainment preferences (Boer et al., 2011) are related to attraction, and it seems likely that similarity - dissimilarity between partners on such factors should be related to relationship functioning within established relationships. In this context, concordance - discordance in pornography use may be yet another factor that may be associated with relationship functioning. It is also possible that differences in pornography use reflect underlying differences in other factors, such as sexual attitudes, erotophilia, sex drive, etc., and that similarity - dissimilarity in these factors are ultimately responsible for differences in relationship functioning. We cannot directly test the basic hypothesis that the associations between concordance - discordance in pornography use and sexual / relationship satisfaction are the product of similarity - dissimilarity in pornography use with the current data. However, we can examine the associations between similarity - dissimilarity on other dimensions and sexual / relationship satisfaction to determine if comparable patterns emerge. We can also explore third variable explanations by considering whether or not concordance-discordance in pornography use adds to the prediction of sexual / relationship satisfaction once more general patterns of similarity - dissimilarity are controlled for.