Casual sexual relationships are common forms of modern sexual relationships. Researchers are paying increased attention to these relationship types, but have been remiss in ensuring that the definitions of the relationships under investigation match participants’ conceptualizations. Thus, the purpose of this dissertation is to determine whether definitions and behavioural scripts for casual sexual relationships can be identified. In Study 1, 23 young adults discussed initiation, maintenance, and termination components of various casual sexual relationships in focus groups and developed consensus definitions for each relationship. Each focus group independently identified four casual sexual relationships: One Night Stand, Booty Call, Fuck Buddies, and Friends with Benefits. These four relationships were the focus of subsequent exploration. Building on the qualitative descriptions created in the focus groups, an online survey was used to determine whether relationship definitions and associated script behaviours could be confirmed in a larger sample (N = 885). In Study 2, a restricted age subsample (i.e., 18-29 years) was used to determine if emerging adults endorsed the proposed definitions. A majority of the sample endorsed the definitions for One Night Stand (96%), Booty Call (93%), Fuck Buddies (83%), and Friends with Benefits (87%). A larger proportion of individuals with sexual intercourse experience endorsed the definitions compared to those without sexual intercourse experience, while previous casual sex experience did not affect definition endorsements. Women demonstrated greater precision in identifying the definitions. In Study 3, the full sample of 885 participants was used to identify the specific script behaviours associated with each relationship. Using behaviourally descriptive items (N = 62) derived from Study 1, participants identified 12 script items for One Night Stand, Booty Call, and Friends with Benefits and 10 script items for Fuck Buddies. Individuals with previous sexual intercourse experience were more adept at identifying the specific behavioural script items, while previous casual sex experience did not affect script endorsements. Again, women were particularly adept at identifying the specific script items. Overall, these findings suggest that specific definitions and respective scripts exist for the One Night Stand, Booty Call, Fuck Buddies, and Friends with Benefits relationships. This knowledge appears broad and may be considered as socio-cultural knowledge of young adults. Numerous implications flow from the understanding that young adults implicitly know what behaviours are associated with these popular forms of casual sexual relationships. Researchers need to ensure they use scientifically sound definitions in order to develop a more sophisticated lexicon of (casual sex) relationships and understand how modern sexual relationships fit within the scope of potential relationship options.

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