Casual sexual relationships and experiences (CSREs) are a common phenomenon experienced by the majority of emerging adults attending college and university. Despite researchers' increased interest towards the topic of casual sex in recent years, there is a lack of validated psychometric measures that operationalize different types of CSREs and an absence of uniformity in the definitions of casual sex. Few studies distinguish clearly between different types of CSREs and few studies include a balanced approach when considering well-being outcomes (i.e., negative and positive markers). The first study of this dissertation aimed to bridge the research gap through the development and validation of the Casual Sex Experiences Scale (CASEX), which measures frequency of four types of CSREs (one-night stands, booty calls, fuck buddies, and friends with benefits). The CASEX's validity (factorial, convergent, divergent) and reliability (internal consistency) were tested in two independent samples. The results indicated that the CASEX can indeed measure the four aforementioned types of CSREs. In the second study, we examined how those four types of CSREs were related to well-being in consensual sexual interactions in a cross-sectional study. We included positive and negative markers of wellbeing. Moreover, we tested whether the relation between CSREs and well-being was moderated by sociosexual attitudes. We derived hypotheses from the theory of cognitive dissonance related to the potential moderating effect of sociosexual attitudes. Participants reported a coexistence of negative and positive well-being outcomes related to CSREs (e.g., positive and negative emotions during and following casual sex). In most cases, sociosexual attitudes did not moderate the relationships between CSREs and well-being outcomes. However, a notable exception was that sociosexual attitudes moderated relationships between CSREs and emotions experienced during and following casual sex, which was expected from the theory of cognitive dissonance. As hypothesized, the relationship between casual sex and negative emotions during and following casual sex was stronger in those participants with less sociosexual attitudes. Nonetheless, some results refuted our hypotheses, for instance, some relationships between casual sex and positive emotions during and following casual sex were stronger in those participants with less sociosexual attitudes. In other words, casual sex seemed to have been less of an emotional experience (positive or negative) in those with more sociosexual attitudes. Overall, this dissertation provides initial evidence in favour of the validity and reliability of the CASEX, which can enable to understand more nuanced relationships between experiences of casual sex and well-being among emerging adults. Findings deepened the understanding of the role of sociosexual attitudes in the relations between different types of CSREs and well-being markers.

Well-being and human development are two concepts within the development debate that are often used as different but defined and operationalised in very similar ways. This has led to a diffuse differentiation between them, where it is unclear what we include in either concept, which can cause validity problems in e.g. research, as it is not clear what we are really studying. This is the motivation for my thesis, to examine how similar these concepts are in practice to determine if they can be conceptualised as they have been previously, or if more effort must be made to differentiate between them. I do this by examining three dimensions which are central to both concepts (Health, Education, and Material standard of living) to see how the concepts correlate within each dimension. These correlations I then control for both GDP per capita and level of democracy. My results show that there is no significant correlation between well-being and human development when controlling for GDP per capita and level of democracy, showing that the concepts are in fact not as similar as they are treated in the literature thus far. In conclusion, this means that the concepts cannot be conceptualised as similarly as they have been before, but instead, more effort must be made to sufficiently differentiate between them.

More college students are experiencing stress that negatively affects their psychological wellbeing. Many universities are reporting that more students are seeking mental health services related to stress (Miller, Elder, Scavone, 2017). The intent of this thesis is to extend the previous research findings by specifically investigating the role of mindfulness on psychological well-being of college students. Participants were asked to complete a self-administered online survey that consists of the mindful attention awareness scale (MAAS) that measures the frequency of mindfulness state, the Psychological well-being scale (PWB) that measures six aspects of wellbeing and happiness, and the generalized self-efficacy scale (GSES). The survey included a section on demographic information such as gender, age, race/ethnicity, and family income. All data was analyzed through the Statistical Package for the Social Sciences (SPSS) and consisted of a series of correlational analyses and multiple regression analyses. We found that mindfulness positively correlated with psychological well-being. Furthermore, we found the mindfulness and self-efficacy significantly predicted the level of psychological well-being. The findings of this study can inform college administrators in the development of more targeted intervention programs that may be utilized for the stability of students psychological wellbeing.

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