Adolescent males are influenced by various social and cultural factors. This qualitative study sought to further understanding about adolescent males' thoughts and behaviors regarding sexual decision-making. Specific exploration encompassed the influences of the identified factors of parents, peers, media, first romantic relationship breakups, and substance use in advancing non-relational attitudes and sexual behavior among White adolescent males. Thematic analysis was conducted using interview data drawn from 11 sexually active, heterosexual, White males, who were 18-19 years old. Interpretive phenomenological methods were applied using computer-assisted approaches for collection and analysis of responses from 12 interview queries. The research facilitated identification of the ways the selected factors influenced the development of casual or non-relational sexual attitudes and behavior. Specific attention addressed the first relationship breakup that ended badly, and substance use. The findings supported prior research indicating peers and media were predictors of influence; likewise, the double standard remains an influential social construct. Findings diverged from prior research indicating that parents were not a significant influence. Professional implications to bolster awareness and communication as well as recommendations for further study were presented. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]