Individuals with intellectual and developmental disabilities face barriers to accessing sex education, including a lack of professional ownership over providing sex education. Limited information exists regarding educator training background, funding structure, and who they serve. We interviewed 58 sex educators of individuals with intellectual and developmental disabilities. We integrated thematic analysis and composite narratives to identify service models and the benefits and challenges associated with them. We identified seven service delivery models: clinic-based board-certified behavior analysis; mental health therapists; small businesses; public health not-for-profits; disability programs; high school-based educators; and university-based educators; and three themes that addressed the strengths and challenges of these service models: Instructional Implications of the Short-term, Drop-in Approach; Getting on the Same Page; and Questioning Who Should Teach Sex Education. Understanding these typologies and their strengths and challenges provide insights into how we can build capacity for sex education services.