The theory of planned behavior proposes that a person's intentions and behaviors are influenced by their attitudes, subjective norms, and perceived behavioral control. Specifically, it suggests that a person's attitude towards a behavior, expectations of others, and feelings of self-efficacy combine to shape their behavioral intentions and actions. This theory, developed by Icek Ajzen, has been applied to understand various communication phenomena and can provide insights into behaviors like sexual initiation. While useful, the theory also has limitations and does not account for all human behaviors.