This thesis explored the dynamics of sexual victimisation disclosure through the development and empirical validation of the Sexual Victimisation Disclosure Processes Model (svDPM). The model posits that disclosure is an ongoing, relational, and complex process, where risks and benefits are constantly weighed, with each disclosure experience shaping further re-disclosure. It unifies the extant literature and identifies key areas for further research. Across three studies, this research examined the barriers and facilitators of disclosure, identifying then elaborating upon the roles of shame and invalidation in either inhibiting or facilitating re-disclosure. Study 1 introduced a gender-inclusive paradigm for identifying victims of sexual violations, investigating both reasons for and against disclosure. Study 2 experimentally examined the effects of invalidating feedback on shame and its subsequent impact on re-disclosure decisions. Study 3B further investigated how perceptions of invalidation, individual traits, and shame management strategies influence re-disclosure intentions. These findings offer insights into how shame, invalidation, and shame-management strategies contribute to the disclosure process. This work provides practical implications for professionals by guiding the establishment of safe environments conducive to voluntary disclosure, through highlighting the importance of minimising perceptions of invalidation and addressing shame in therapeutic settings.