The purpose of this study was to investigate the mediating effects of unwanted sexual behaviors and sexual consciousness in adult attachment and heterosexual satisfaction of Korean unmarried men and women. A survey was conducted with 246 respondents through an online-survey. Only the data of 211 participants were statistically analyzed except inappropriate subjects. Experience of close relationship scales, Heterosexual satisfaction scale, Consensual unwanted sex behavior scale, and Sexual consciousness scale were utilized. Descriptive statistics and Pearson correlation analysis was performed by SPSS 22.0. A multiple mediating effects test was conducted to estimate the proposed mediating effects and a bootstrapping procedure was utilized with the SPSS Macro Program. The research findings are as follows: adult attachment and heterosexual satisfaction, adult attachment and sexual consciousness were negatively correlated. Adult attachment and consensual unwanted sex behavior, heterosexual satisfaction and consensual unwanted sex behavior showed non significant correlations. There were significant positive correlations among sexual consciousness and heterosexual satisfaction. The male group subjects rated themselves significantly higher than the female group subjects on consensual unwanted sex behavior and sexual consciousness. The mediating effect of consensual unwanted sex behavior was statistically insignificant but sexual consciousness had significant mediating effects in the mediating model. Adult attachment had significant indirect effects on the heterosexual satisfaction through sexual consciousness, which suggests that a higher level of secure attachment leads greater sexual consciousness and thus more heterosexual satisfaction.