Background and Objectives: Sexual violence constitutes a major public health concern that undermines safety, bodily integrity, and autonomy. This study aimed to assess the prevalence, risk factors, and preventive strategies related to sexual misconduct in party-related social settings in Poland. Materials and Methods: A cross-sectional survey was conducted between 18 and 27 March 2025 among a representative sample of 1000 adults using computer-assisted web interviews. The questionnaire covered perceived risk, preventive measures, and personal or witnessed experiences of sexual violence. Data were analyzed using chi-square tests and multivariable logistic regression. Results: More than half of respondents reported unwanted touching (53.8%) or persistent harassment (46.9%), and 54.1% had encountered sexual comments. Drug-facilitated assaults were reported by approximately 10% of participants, while 12.3% indicated forced sex. Despite frequent reliance on precautionary measures (e.g., returning home with friends in 64.2% of cases), concerns about sexual victimization were widespread. Multivariable analysis showed that women (aOR 1.91), young adults (aOR 2.80 for those aged 18–24 years), and sexual minorities were disproportionately affected. Conclusions: This study highlights that sexual violence in party-related settings is a structural rather than marginal problem in Poland. Women, young adults, and sexual minorities are disproportionately affected. Effective prevention requires multilevel interventions, including bystander programs, venue-level safety policies, and broader public health strategies to reduce tolerance for sexual harassment and violence.