Chronic post-vasectomy scrotal pain (CPVSP) is a poorly quantified clinical problem. Data in this area has been based on retrospective cohort studies, with variable lengths of follow up and compliance. This has resulted in quoted figures of CPVSP varying between 2 & 52% depending upon the definition. We have undertaken the first prospective assessment of CPTP to assess the extent of testicular pain in men before and after vasectomy. Our objective is to produce accurate data to allow better characterisation of men considering this procedure, and to improve informed consent with regard to outcomes.